# Doxycycline Dog Cat Dose: Tick Disease and Respiratory Infection Guide


## Key Takeaways

- Doxycycline is a broad-spectrum bacteriostatic antibiotic commonly prescribed for tick-borne diseases (e.g., ehrlichiosis, anaplasmosis, Lyme disease) and bacterial respiratory infections in dogs and cats. Standard dosing is 5 mg/kg every 12 hours or 10 mg/kg every 24 hours, with treatment durations typically ranging from 14 to 28 days, though longer courses may be required for specific conditions like bartonellosis.
- Doxycycline achieves effective plasma concentrations for 24 hours when administered at 10 mg/kg once daily in dogs and cats, a higher mg/kg dose than in humans due to faster drug clearance in these species.
- Tick-borne diseases necessitate prompt diagnosis via serology or PCR, and doxycycline is the first-line treatment, though it may not fully resolve chronic clinical signs in cases of Lyme disease. In heartworm disease, doxycycline is an adjunct therapy targeting *Wolbachia* to weaken adult worms, not a direct heartwormicide or preventive.
- Respiratory infections in cats caused by *Mycoplasma* or *Chlamydia* species, and canine infectious respiratory disease complex (CIRDC) are common indications for doxycycline, which exhibits excellent penetration into respiratory secretions. Antimicrobial resistance to doxycycline in *E. coli* isolates is approximately 22%, necessitating culture and sensitivity testing for refractory cases.
- Adverse effects include gastrointestinal upset, which can be mitigated by administering with food, and a risk of esophageal stricture in cats if tablets lodge. Doxycycline should be used cautiously in young animals due to potential effects on bone and teeth development.
- Diagnostic workup prior to prescribing doxycycline should include CBC, biochemistry panel, and pathogen-specific testing (serology, PCR, or urinalysis/culture), as serology can be falsely negative during active *Bartonella* infection.

---

**Direct answer:** For most susceptible bacterial infections in dogs and cats, doxycycline is dosed at 5 mg/kg orally every 12 hours, or 10 mg/kg orally every 24 hours. This dosing achieves effective plasma concentrations in both species for a full 24-hour period when given once daily [<a href="#ref-1">1</a>]. However, specific diseases such as certain tick-borne infections may require higher doses (up to 10 mg/kg every 12 hours) or extended treatment durations. Always confirm the exact dose and duration with your veterinarian, as treatment length varies significantly based on the specific pathogen and the individual patient's condition.

**Owner-facing triage summary:** If your veterinarian has prescribed doxycycline for your [dog](/knowledge/veterinary-medicine/clinical-methods/dog) or [cat](/knowledge/veterinary-medicine/clinical-methods/cat), give the medication exactly as directed, preferably with food to reduce gastrointestinal upset. Complete the entire course even if your pet appears improved. Contact your veterinarian immediately if you observe severe vomiting, diarrhea (or diarrhoea), loss of appetite, or any signs of an allergic reaction such as facial swelling or hives. Do not administer doxycycline to pregnant animals or young animals without explicit veterinary approval due to risks of bone and teeth abnormalities.

---

## At a Glance: Doxycycline Dosing Reference Table

| Species | Standard Dose | Common Frequency | Typical Duration | Primary Indications |
|--|--|--|--|--|
| Dog | 5 mg/kg | Every 12 hours (q12h) | 14 to 28 days | Tick-borne diseases (e.g., ehrlichiosis, anaplasmosis, Lyme), respiratory infections, bartonellosis [<a href="#ref-2">2</a>] |
| Dog | 10 mg/kg | Every 24 hours (q24h) | 14 to 28 days | Alternative dosing for owner compliance; maintains effective plasma levels [<a href="#ref-1">1</a>] |
| Cat | 5 mg/kg | Every 12 hours (q12h) | 14 to 28 days | Respiratory infections (e.g., Mycoplasma, Chlamydia), tick-borne diseases |
| Cat | 10 mg/kg | Every 24 hours (q24h) | 14 to 28 days | Alternative once-daily dosing; palatable tablet formulations available [<a href="#ref-1">1</a>] |
| Dog (Bartonella) | 5 mg/kg | Every 12 hours (q12h) | 6 weeks minimum | Pyogranulomatous lymphadenitis associated with *[Bartonella henselae](/knowledge/bacteria/pet-bacteria/bartonella-henselae)* [<a href="#ref-2">2</a>] |

**Important note:** This table serves as a clinical reference. Individual patient factors, including renal or hepatic function, concurrent medications, and the specific pathogen involved, may necessitate dose adjustments. The duration of therapy for tick-borne diseases is often extended beyond clinical resolution to ensure complete pathogen clearance.

---

## Understanding Doxycycline: Mechanism and Pharmacokinetics

Doxycycline is a broad-spectrum tetracycline antibiotic that inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit. It is bacteriostatic, meaning it stops bacterial growth and allows the animal's immune system to clear the infection. Its lipophilic nature allows excellent tissue penetration, including into the respiratory tract, prostate, and central nervous system.

### Pharmacokinetic Profile in Dogs and Cats

Research by van Gool and colleagues demonstrated that a dosage of 10 mg/kg/day of doxycycline is required to obtain effective plasma concentrations in dogs and cats for 24 hours when administered once daily [<a href="#ref-1">1</a>]. This study, which used palatable tablet formulations (Ronaxan), compared the pharmacokinetics between dogs, cats, and humans. The findings underscore a critical species difference: dogs and cats metabolize and eliminate doxycycline more rapidly than humans, necessitating higher mg/kg doses to achieve comparable therapeutic blood levels.

A subsequent study by Wilson and colleagues measured doxycycline concentrations in serum and urine four hours after oral administration of 5 mg/kg every 12 hours in dogs and cats [<a href="#ref-3">3</a>]. The serum concentrations at 2 hours post-dosing were reported as 4.2 +/- 1.0 mg/mL (likely a typographical representation of µg/mL). This study focused on urinary tract infections and confirmed that doxycycline reaches the urinary tract, although its efficacy there is variable depending on urine pH and the specific pathogen.

### The "Double Dose" Confusion

A common point of confusion in veterinary medicine is the difference between the human dose and the veterinary dose. In human medicine, doxycycline is typically dosed at 100 mg per day (approximately 1.5 to 2 mg/kg). In veterinary medicine, the dose is significantly higher on a mg/kg basis due to differences in drug clearance [<a href="#ref-1">1</a>]. A 10 kg dog would receive 50 to 100 mg per day, whereas a 70 kg human might receive only 100 mg per day. This is a normal species variation, not an error.

---

## Tick-Borne Diseases: Primary Indications

Tick-borne diseases represent one of the most common indications for doxycycline therapy in dogs and, less frequently, cats. The antibiotic is the treatment of choice for several rickettsial and bacterial pathogens transmitted by ticks.

### Ehrlichiosis and Anaplasmosis

These diseases are caused by obligate intracellular bacteria (*Ehrlichia* spp. and *Anaplasma* spp.) that infect white blood cells. Doxycycline is highly effective against these organisms. The standard recommended dose is 5 mg/kg every 12 hours or 10 mg/kg every 24 hours, continued for a minimum of 14 days, though many clinicians extend therapy to 28 days to ensure clearance.

Clinical improvement is typically rapid, often within 24 to 48 hours of initiating therapy. However, laboratory abnormalities such as thrombocytopenia may take weeks to resolve.

### Lyme Disease (Borreliosis)

Caused by *Borrelia burgdorferi*, Lyme disease is another tick-borne condition where doxycycline is the first-line treatment. The same dosing regimen (5 mg/kg q12h or 10 mg/kg q24h) is used, with a recommended duration of 14 to 28 days. While doxycycline effectively eliminates the bacteria, it may not fully resolve all clinical signs, particularly in chronic cases where immune-mediated joint damage has occurred.

### Canine Bartonellosis

*Bartonella henselae*, the causative agent of cat scratch disease in humans, can also infect dogs. A case report by Morales and colleagues documented two dogs with pyogranulomatous lymphadenitis associated with *B. henselae* DNA [<a href="#ref-2">2</a>]. One dog recovered after 6 weeks of doxycycline at 5 mg/kg every 12 hours. The other dog received a more complex regimen including doxycycline at a higher dose (17.3 mg/kg every 24 hours for 4 weeks) combined with azithromycin and corticosteroids.

This case highlights several important points:
1. **Extended duration:** Bartonellosis often requires prolonged therapy (4 to 6 weeks or longer).
2. **Diagnostic challenges:** Antibody testing (IFA) may be negative during active disease; PCR of affected tissue may be necessary for diagnosis [<a href="#ref-2">2</a>].
3. **Combination therapy:** In some cases, doxycycline may be combined with other antibiotics or immunomodulatory drugs.

### Heartworm Disease and Doxycycline

While heartworm disease (*Dirofilaria immitis*) is caused by a nematode parasite, doxycycline plays a supportive role in treatment protocols. Doxycycline targets *Wolbachia*, an endosymbiotic bacterium within the heartworm, which is essential for the worm's fertility and survival. By eliminating *Wolbachia*, doxycycline weakens the adult worms and reduces the inflammatory response to their death.

It is important to note that doxycycline is not a heartworm preventive and does not kill adult heartworms [<a href="#ref-4">4</a>]. It is used as an adjunct to adulticide therapy (melarsomine) and macrocyclic lactone preventives. The standard protocol involves administering doxycycline (10 mg/kg every 12 hours) for 30 days prior to and following the adulticide injections. This approach is supported by the American Heartworm Society, although the source packet primarily discusses macrocyclic lactone resistance and prevention strategies [<a href="#ref-4">4</a>], [<a href="#ref-5">5</a>].

---

## Respiratory Infections: Clinical Application

Doxycycline is a valuable antibiotic for respiratory tract infections in both dogs and cats, particularly those caused by atypical bacteria that do not respond to beta-lactam antibiotics (e.g., penicillins).

### Feline Upper Respiratory Infections

In cats, common respiratory pathogens include *Mycoplasma felis*, *Chlamydia felis*, and *[Bordetella bronchiseptica](/knowledge/bacteria/pet-bacteria/bordetella-bronchiseptica)*. Doxycycline is often the drug of choice for these infections due to its excellent activity against these organisms and its high concentrations in respiratory secretions.

The standard dose for cats is 5 mg/kg every 12 hours or 10 mg/kg every 24 hours [<a href="#ref-1">1</a>]. Treatment is typically continued for 7 to 14 days, but may be extended to 21 days for *Chlamydia* infections to prevent recurrence.

### Canine Infectious Respiratory Disease Complex (CIRDC)

Also known as "kennel cough," CIRDC can involve multiple pathogens, including *Bordetella bronchiseptica*, *Mycoplasma* spp., and various viruses. Doxycycline is often selected when a bacterial component is suspected or confirmed, particularly in cases that do not respond to first-line antibiotics.

### Antimicrobial Resistance Considerations

A study by Boothe and colleagues examined antimicrobial resistance patterns in canine and feline pathogenic *E. coli* isolates [<a href="#ref-6">6</a>]. The study found that doxycycline resistance was 22% among the isolates tested. This is comparable to resistance rates for enrofloxacin (20%) and trimethoprim-sulfamethoxazole (19%), but significantly lower than resistance to amoxicillin (46%) and amoxicillin-clavulanate (37%) [<a href="#ref-6">6</a>].

This data has two important clinical implications:
1. **Empirical therapy:** Doxycycline may be a reasonable empirical choice for respiratory infections where *E. coli* is a suspected pathogen, but culture and sensitivity testing is recommended for severe or refractory cases.
2. **Regional variation:** Resistance rates were highest in isolates from the southern and central United States, suggesting geographic variability that may influence antibiotic selection [<a href="#ref-6">6</a>].

---

## Doxycycline in Urinary Tract Infections

While not a first-line choice for uncomplicated urinary tract infections (UTIs), doxycycline may be used in certain situations. The study by Wilson and colleagues specifically evaluated doxycycline concentrations in urine and its efficacy against urinary pathogens [<a href="#ref-3">3</a>].

The study found that doxycycline is excreted in the urine, but concentrations may be variable. The clinical significance of this finding is that doxycycline may be effective for UTIs caused by susceptible organisms, but it should not be used empirically for UTIs without culture and sensitivity testing. The study also highlighted that tetracycline, an older drug, achieves higher urinary concentrations but has a broader resistance profile [<a href="#ref-3">3</a>].

For UTIs, the dose used in the study was 5 mg/kg every 12 hours for both dogs and cats [<a href="#ref-3">3</a>]. However, given the 22% resistance rate in *E. coli* isolates [<a href="#ref-6">6</a>], doxycycline should be reserved for cases where susceptibility is confirmed or where other antibiotics are contraindicated.

---

## Safety Profile and Adverse Effects

Doxycycline is generally well-tolerated in dogs and cats, but adverse effects can occur.

### Gastrointestinal Effects

The most common side effects are gastrointestinal, including nausea, vomiting, and diarrhea (or diarrhoea). These effects are dose-dependent and more common with higher doses. Administering doxycycline with food can help mitigate these effects. If vomiting occurs within 30 minutes of administration, the dose should be repeated, but if vomiting persists, the veterinarian should be contacted.

### Esophageal Stricture

A serious, potentially life-threatening adverse effect in cats is esophageal stricture. Doxycycline tablets or capsules can become lodged in the esophagus and cause severe inflammation and scarring. To prevent this:
- Administer the medication with a small amount of food or water.
- Follow the dose with a bolus of water or a small treat.
- In cats, consider using a liquid formulation or specially formulated palatable tablets [<a href="#ref-1">1</a>].

### Effects on Bone and Teeth Development

Doxycycline, like other tetracyclines, can bind to calcium and be deposited in developing bones and teeth. This can cause permanent yellow-brown discoloration of teeth and may affect bone growth. Therefore, doxycycline should be used with caution in young animals (under 6 months of age) and in pregnant or nursing animals. However, doxycycline binds less calcium than other tetracyclines, so the risk is lower, but still present.

### Hepatotoxicity and Nephrotoxicity

Rare cases of liver toxicity have been reported, particularly with high doses or prolonged therapy. Renal toxicity is uncommon with doxycycline, but caution is advised in animals with pre-existing kidney disease. Baseline blood work and periodic monitoring may be recommended for animals on long-term therapy.

---

## Drug Interactions

Doxycycline can interact with several other medications:
- **Antacids and calcium supplements:** These can bind doxycycline in the gastrointestinal tract, reducing its absorption. Separate administration by at least 2 hours.
- **Iron supplements:** Similar to antacids, iron can reduce doxycycline absorption.
- **Phenobarbital and other enzyme inducers:** These drugs can accelerate doxycycline metabolism, potentially reducing its efficacy.
- **Warfarin:** Doxycycline may potentiate the effects of warfarin, increasing bleeding risk.

---

## Diagnostic Considerations Before Prescribing

Before initiating doxycycline therapy, a veterinarian will typically perform a thorough diagnostic workup. This may include:

1. **Complete Blood Count (CBC):** To assess for anemia, thrombocytopenia, or leukocytosis, which are common in tick-borne diseases.
2. **Biochemistry Panel:** To evaluate organ function, particularly liver and kidneys.
3. **Serology or PCR Testing:** To confirm the specific pathogen. For tick-borne diseases, panels that test for *Ehrlichia*, *Anaplasma*, *Borrelia*, and *Bartonella* are commonly used.
4. **Urinalysis and Culture:** For suspected UTIs, a urine culture is essential to guide antibiotic selection [<a href="#ref-3">3</a>], [<a href="#ref-6">6</a>].

The case report on *Bartonella* highlights a critical diagnostic point: serology can be falsely negative during active disease [<a href="#ref-2">2</a>]. In this report, both dogs had negative antibody titers despite having PCR-confirmed *B. henselae* infection. Therefore, PCR testing on blood or affected tissues may be necessary when bartonellosis is suspected [<a href="#ref-2">2</a>].

---

## Unsafe Home Remedies and Over-the-Counter Alternatives

There are no safe or effective over-the-counter alternatives to doxycycline for the treatment of tick-borne diseases or bacterial respiratory infections. Attempting to treat these conditions without veterinary supervision can lead to:
- **Incomplete treatment:** Subtherapeutic doses may suppress clinical signs without eliminating the pathogen, leading to chronic infection and antimicrobial resistance.
- **Incorrect diagnosis:** Many diseases present with similar clinical signs. Without proper diagnostics, a condition requiring different treatment may be missed.
- **Adverse effects:** Inappropriate use of antibiotics can cause harm to the animal.

Never administer doxycycline intended for human use without veterinary guidance, as the concentration and formulation may be inappropriate. Similarly, do not use expired antibiotics, as they may be degraded and ineffective.

---

## Prevention of Tick-Borne Diseases

Prevention is always preferable to treatment. Strategies to reduce the risk of tick-borne diseases include:

1. **Tick Control Products:** Use veterinarian-approved topical or oral tick preventives year-round in endemic areas. The Companion Animal Parasite Council (CAPC) recommends year-round prevention in most regions.
2. **Environmental Management:** Keep grass short, remove leaf litter, and create barriers between wooded areas and living spaces.
3. **Tick Checks:** After outdoor activities, thoroughly check your pet for ticks, paying close attention to the ears, neck, and between toes.
4. **Vaccination:** A Lyme disease vaccine is available for dogs in endemic areas. Discuss with your veterinarian whether this is appropriate for your pet.

Regarding heartworm prevention, the American Heartworm Society recommends year-round administration of macrocyclic lactone preventives [<a href="#ref-4">4</a>]. While doxycycline is used in heartworm treatment protocols, it is not a preventive [<a href="#ref-4">4</a>]. The 2019 Shelter Heartworm Management Practices Survey indicated that many shelters have adopted these guidelines for animals in their care [<a href="#ref-5">5</a>].

---

## Prognosis and Monitoring

The prognosis for animals with tick-borne diseases or bacterial respiratory infections treated with doxycycline is generally excellent, provided treatment is initiated promptly and completed fully.

**Expected response:** Clinical improvement is often seen within 24 to 72 hours. However, this does not mean the infection is cleared. The full course of antibiotics must be completed to prevent relapse.

**Monitoring:** Follow-up blood work is often recommended to confirm resolution of laboratory abnormalities. For example, platelet counts should return to normal in ehrlichiosis. For chronic conditions like bartonellosis, repeat PCR testing may be recommended to confirm clearance [<a href="#ref-2">2</a>].

**Poor response:** If there is no clinical improvement within 48 to 72 hours, the diagnosis should be re-evaluated. Possible reasons for lack of response include:
- Incorrect diagnosis
- Antimicrobial resistance [<a href="#ref-6">6</a>]
- Inadequate dosing
- Concurrent infection or immunosuppression

---

## Limitations and When to Contact a Veterinarian

This article provides general information about doxycycline dosing and use in dogs and cats. It is not a substitute for professional veterinary advice, diagnosis, or treatment. Individual cases may require different dosing, durations, or alternative therapies.

**Breed-level information cannot predict individual responses.** While certain breeds may have genetic predispositions to specific diseases or drug sensitivities, the information presented here does not account for these variations. Your veterinarian is the only person qualified to make treatment decisions for your pet.

**Emergency red flags that require immediate veterinary attention:**
- Severe or bloody vomiting or diarrhea (diarrhoea)
- Difficulty breathing or swallowing
- Facial swelling, hives, or other signs of allergic reaction
- Collapse or extreme lethargy
- Jaundice (yellowing of the gums or skin)
- Seizures

If you have any concerns about your pet's condition or treatment, contact your veterinarian immediately. Do not adjust the dose or discontinue the medication without veterinary approval.

---

## Frequently Asked Questions

### 1. What is the standard doxycycline dose for a dog?
The standard dose is 5 mg/kg every 12 hours, or 10 mg/kg every 24 hours. This dosing achieves effective plasma concentrations for a full 24-hour period [<a href="#ref-1">1</a>].

### 2. What is the standard doxycycline dose for a cat?
The standard dose is 5 mg/kg every 12 hours, or 10 mg/kg every 24 hours. Palatable tablet formulations are available to improve compliance [<a href="#ref-1">1</a>].

### 3. How long does a dog or cat need to take doxycycline for a tick-borne disease?
Treatment duration is typically 14 to 28 days, but may be longer for certain diseases. For example, bartonellosis may require 6 weeks or more of therapy [<a href="#ref-2">2</a>].

### 4. Can doxycycline be given with food?
Yes, giving doxycycline with food can help reduce gastrointestinal upset. However, avoid giving it with dairy products or calcium supplements, as these can reduce absorption.

### 5. What are the common side effects of doxycycline in pets?
The most common side effects are gastrointestinal, including vomiting, nausea, and diarrhea (or diarrhoea). In cats, there is a risk of esophageal stricture if tablets lodge in the esophagus.

### 6. Is doxycycline safe for pregnant or nursing animals?
Doxycycline should be used with caution in pregnant or nursing animals due to the risk of bone and teeth abnormalities in the developing fetus or nursing offspring. It should only be used when the benefits clearly outweigh the risks, under veterinary supervision.

### 7. Can doxycycline be used for heartworm disease?
Doxycycline is used as an adjunct in heartworm treatment protocols to target *Wolbachia* bacteria. It is not a preventive and does not kill adult heartworms [<a href="#ref-4">4</a>].

### 8. What should I do if I miss a dose of doxycycline?
If you miss a dose, give it as soon as you remember. If it is almost time for the next dose, skip the missed dose and resume the regular schedule. Do not give a double dose.

---

## Veterinary Disclaimer

**This article is educational and is not a substitute for veterinary diagnosis or treatment.** Always consult with a qualified veterinarian regarding any medical concerns about your pet. The information provided here is based on published research and clinical guidelines but may not be appropriate for every individual animal.

---


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## Sources

<a id="ref-1"></a>[<a href="#ref-1">1</a>] [[Doxycycline: pharmacokinetics and suggested dosage in dogs and cats].](https://pubmed.ncbi.nlm.nih.gov/3187973/)

<a id="ref-2"></a>[<a href="#ref-2">2</a>] [Detection of Bartonella henselae DNA in two dogs with pyogranulomatous lymphadenitis.](https://pubmed.ncbi.nlm.nih.gov/17331050/)

<a id="ref-3"></a>[<a href="#ref-3">3</a>] [Susceptibility of bacteria from feline and canine urinary tract infections to doxycycline and tetracycline concentrations attained in urine four hours after oral dosage.](https://pubmed.ncbi.nlm.nih.gov/16498827/)

<a id="ref-4"></a>[<a href="#ref-4">4</a>] [Macrocyclic lactone resistance in Dirofilaria immitis: risks for prevention of heartworm disease.](https://pubmed.ncbi.nlm.nih.gov/34717929/)

<a id="ref-5"></a>[<a href="#ref-5">5</a>] [The American Heartworm Society and Association of Shelter Veterinarians' 2019 Shelter Heartworm Management Practices Survey.](https://pubmed.ncbi.nlm.nih.gov/32470870/)

<a id="ref-6"></a>[<a href="#ref-6">6</a>] [Antimicrobial resistance and pharmacodynamics of canine and feline pathogenic E. coli in the United States.](https://pubmed.ncbi.nlm.nih.gov/23033458/)

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