What to Do If Your Dog's Medication Is Making Them Sleepy

Name: What to Do If Your Dog's Medication Is Making Them Sleepy
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

Drowsiness is a common, often expected side effect of medications targeting the central nervous system, including those for pain, anxiety, and seizures, typically most pronounced in the initial 24-48 hours of treatment.
Distinguishing between normal sleepiness and a medical emergency is critical; signs requiring immediate emergency veterinary care include collapse, labored breathing (<10 breaths/min), pale/blue gums, seizures, or unresponsiveness.
Moderate lethargy, characterized by reluctance to move for basic needs (eating, drinking, urination) or significant new stumbling, warrants a same-day veterinary appointment for potential dose adjustment or medication change.
Owners should meticulously monitor vital signs such as resting respiratory rate (normal: 10-30 breaths/min), gum color (should be pink and moist), and responsiveness, documenting these for veterinary consultation.
Never abruptly discontinue prescribed medications or alter dosages without explicit veterinary guidance, as this can lead to withdrawal effects or a resurgence of the underlying condition.
If sleepiness is mild and the dog remains responsive, eats, and drinks, continue the medication as prescribed and monitor closely for 24 hours, escalating care if symptoms worsen or new concerning signs emerge.

If your dog is sleepier than usual after starting a new medication, this is often a normal, expected side effect. Many common drugs used for pain, anxiety, seizures, and nausea can cause drowsiness, especially in the first few days of treatment. However, there is a difference between "sleepy" and "dangerously lethargic," and knowing that difference can help you decide whether to relax, call your vet, or head to an emergency clinic right now.

Watch your dog closely for the first 24 to 48 hours after any new medication. Write down how many hours they sleep, whether they wake easily, and whether they still eat, drink, and walk normally. This record will help your veterinarian adjust the plan if needed. Never stop a prescribed medication or change its dose on your own, as some drugs cause withdrawal effects or a return of the original problem.

Is This an Emergency?

Some signs mean your dog needs immediate, in-person emergency care. Do not wait to see if they improve. Do not try to manage these signs at home or through a phone call.

{
 "type": "triage",
 "title": "Urgency triage by severity of signs",
 "tiers": [
  {
   "tier": "danger",
   "label": "Go to an emergency vet now",
   "signs": [
    "Collapse or inability to stand, breathing slower than 10 breaths per minute while resting, pale, white, or blue gums, seizures, unresponsiveness when you call their name or touch them, vomiting that will not stop, a body temperature below 99°F (37.2°C)"
   ],
   "action": [
    "Call the nearest emergency clinic on the way",
    "This can indicate a severe drug reaction, overdose, or a separate medical crisis",
    "Do not induce vomiting unless a veterinarian tells you to"
   ]
  },
  {
   "tier": "warn",
   "label": "Book a same-day appointment",
   "signs": [
    "Extreme lethargy where your dog will not get up to eat, drink, urinate, or walk at all, stumbling or wobbling that is new, confusion or seeming lost in familiar rooms, no interest in food for more than 12 hours, repeated vomiting or diarrhea"
   ],
   "action": [
    "Call your regular veterinarian as soon as they open",
    "They may want to adjust the dose, change the drug, or run blood tests",
    "Keep your dog comfortable and quiet while you wait"
   ]
  },
  {
   "tier": "safe",
   "label": "Watch at home for 24 hours",
   "signs": [
    "Your dog sleeps more than usual but wakes easily for meals, treats, or bathroom breaks, walks with a slightly slower or wobbly gait, seems calm or drowsy but responds normally to you, still drinks water and eats at least some food"
   ],
   "action": [
    "Continue the medication as prescribed",
    "Monitor your dog's breathing at rest and their gum color twice a day",
    "If sleepiness worsens or new signs appear, move up to the same-day category"
   ]
  }
 ]
}

Urgency Level	Signs You Can See	What To Do
Go to an emergency vet now	Collapse or inability to stand, breathing slower than 10 breaths per minute while resting, pale, white, or blue gums, seizures, unresponsiveness when you call their name or touch them, vomiting that will not stop, a body temperature below 99°F (37.2°C)	Call the nearest emergency clinic on the way. This can indicate a severe drug reaction, overdose, or a separate medical crisis. Do not induce vomiting unless a veterinarian tells you to.
Book a same-day appointment	Extreme lethargy where your dog will not get up to eat, drink, urinate, or walk at all, stumbling or wobbling that is new, confusion or seeming lost in familiar rooms, no interest in food for more than 12 hours, repeated vomiting or diarrhea	Call your regular veterinarian as soon as they open. They may want to adjust the dose, change the drug, or run blood tests. Keep your dog comfortable and quiet while you wait.
Watch at home for 24 hours	Your dog sleeps more than usual but wakes easily for meals, treats, or bathroom breaks, walks with a slightly slower or wobbly gait, seems calm or drowsy but responds normally to you, still drinks water and eats at least some food	Continue the medication as prescribed. Monitor your dog's breathing at rest and their gum color twice a day. If sleepiness worsens or new signs appear, move up to the same-day category.

Why Medications Cause Sleepiness

Most drugs that cause drowsiness work on the brain or nervous system. For example, sedatives and anti-anxiety medications, such as trazodone, calm the brain by affecting chemical messengers called neurotransmitters. Pain medications, including gabapentin and opioids, also dampen nerve signals, which can slow your dog down. Even some antibiotics and anti-nausea drugs list drowsiness as a common side effect.

This sleepiness is often strongest in the first few days. Your dog's body is adjusting to the drug, and many pets develop a tolerance to the sedating effect within a week. If your dog is eating, drinking, and responding to you, the drowsiness is likely within the normal range. The US Food and Drug Administration notes that side effects vary by drug and by individual animal, and that owners should report anything concerning to their veterinarian.

What Else Could Be Going On

Sleepiness is not always caused by the medication itself. Sometimes the underlying condition, such as pain, infection, or anxiety, is exhausting your dog. A dog with arthritis may sleep more because moving hurts, not because of the painkiller. A dog recovering from a seizure may be tired for hours afterward.

Another possibility is that the dose is too high for your dog's size, age, or liver and kidney function. Older dogs and dogs with liver or kidney disease clear drugs more slowly, so the medication builds up in the body and causes deeper sedation. This is why dosing must come from your treating veterinarian, who knows your dog's weight, blood work, and medical history. Never split pills or adjust timing without explicit instructions.

Rarely, extreme sleepiness can signal a more serious problem, such as low blood sugar, a drop in blood pressure, or an allergic reaction that is affecting the brain. These situations are why the emergency signs above matter. If your dog's gums are pale, their breathing is very slow, or they cannot be roused, do not wait for a phone call to be returned.

What You Can Do Right Now

Start by checking your dog's vital signs at home. Count their breathing rate while they rest. A normal resting rate for a dog is usually between 10 and 30 breaths per minute, though large breeds tend to breathe slower. Look at their gums. They should be pink and moist, not pale, white, blue, or gray. Gently press a finger on the gum and release. The color should return within two seconds.

Encourage your dog to drink water. Offer small amounts of a bland meal, such as boiled chicken and rice, if they are not interested in their regular food. Keep them in a quiet, safe space where they cannot fall off furniture or injure themselves. Do not give any additional medications, including over-the-counter drugs, without veterinary approval.

If your dog is only mildly sleepy, you can continue the medication and monitor them for 24 hours. If they are still extremely drowsy after three days, or if the sleepiness seems to be getting worse, call your veterinarian. They may lower the dose, switch to a different drug, or recommend giving the medication at night instead of the morning. The American Veterinary Medical Association advises owners to keep a list of all medications and to ask questions about expected side effects before starting a new prescription.

When to Call Versus When to Go

A phone call is appropriate when your dog is sleepy but stable. Describe exactly what you see: how many hours they have slept, whether they wake for food and water, their breathing rate, and their gum color. Your veterinarian can use this information to decide whether a dose adjustment is safe or whether they need to see your dog in person.

Go to an emergency clinic when your dog cannot be woken, cannot stand, is breathing very slowly, has pale gums, or has a seizure. These signs can indicate a life-threatening problem that no phone call can resolve. Trust your instincts. If you feel something is seriously wrong, it is better to have your dog checked than to wait.

What You Can Safely Do at Home Right Now

If your dog is sleepy but breathing normally, eating and drinking, and responding when you call them, you can usually monitor them at home for the next few hours. Your main job is to keep them comfortable and safe while the medication works through their system.

Make sure your dog has a quiet, warm place to rest where they will not be stepped on or disturbed by children or other pets. Keep fresh water within easy reach. Do not force them to eat, but do offer a small meal at their normal time. Some medications cause nausea, and an empty stomach can make that worse.

Do not give your dog any additional medication, including over-the-counter products, to counteract the sleepiness. Do not give caffeine, stimulants, or any human medication. These can interact badly with the drug your veterinarian prescribed and cause serious harm. The US Food and Drug Administration warns that giving pets human medication without veterinary guidance is a common cause of poisoning and dosing errors. Read the FDA guidance on safe use of pet medications for more on why this matters.

Do not stop the medication on your own. If the sleepiness is a normal side effect, stopping suddenly could leave your dog's original condition untreated. If the sleepiness is severe, stopping could still be the right call, but your veterinarian should make that decision.

Do not let a sleepy dog off-leash outside. Their reaction time is slower, and they may not respond to your voice or to danger. Use a leash even in a fenced yard.

What to Write Down Before You Call

Before you contact your veterinarian, gather a few specific observations. This makes the phone call faster and helps the vet give you better advice.

Write down the name of the medication and the dose you gave. Check the label if you are unsure. Note the exact time you gave it. Note when you first noticed the sleepiness.

Measure your dog's breathing rate while they are resting. Count the number of breaths in 15 seconds and multiply by four. A normal resting rate for most dogs is between 15 and 30 breaths per minute. Write down the number.

Check your dog's gum color. Lift their lip and look. Healthy gums are pink, like bubble gum. Pale, white, blue, or brick-red gums are a warning sign. Write down what you see.

Note whether your dog is just sleepy or actually hard to wake. Can they lift their head when you call their name? Do they stand up if you gently touch them? Can they walk without stumbling or collapsing?

Write down whether they have eaten, drunk water, urinated, or had a bowel movement since the medication. Note any vomiting, diarrhea, or drooling.

Side Effect Severity Chart

Use this chart to sort what you are seeing. If any sign falls in the red column, seek emergency care immediately.

Sign You Observe	Green: Normal Side Effect	Yellow: Call Your Vet Today	Red: Emergency, Go Now
Sleepiness	Sleeps more than usual but wakes easily	Very hard to wake, but does wake	Cannot be woken at all
Breathing	Normal rate, no effort	Slightly faster or slower than usual	Labored, gasping, or fewer than 10 breaths per minute
Gum color	Pink	Pale pink	White, blue, or brick red
Walking	Slightly wobbly but coordinated	Stumbles often, needs help to stand	Collapses or cannot stand
Eating and drinking	Normal or slightly less	Refuses food but drinks water	Refuses both food and water
Other signs	None	Vomiting once, mild diarrhea	Repeated vomiting, seizures, or swelling of the face

When to Call the Vet Checklist

Call your veterinarian today if any of these are true:

Your dog is very hard to wake but does wake eventually.
Your dog refuses to eat or drink for more than 12 hours.
Your dog vomits more than once.
Your dog stumbles or falls when trying to walk.
The sleepiness gets worse over time instead of improving.
Your dog has a known heart, liver, or kidney condition.
Your dog is very young, very old, or pregnant.
You are unsure whether the dose you gave was correct.

If you are unsure whether a sign warrants a call, call anyway. Veterinary teams are used to these questions and would rather reassure you than miss a problem. The American Veterinary Medical Association offers guidance on working with your veterinarian on medication questions and when to seek care.

What a Veterinary Visit Usually Involves

If you bring your dog in, the veterinarian will start by asking about the medication, the dose, the timing, and what you have observed. They will ask about your dog's medical history and any other medications or supplements.

The physical exam will include taking your dog's temperature, listening to the heart and lungs, feeling the abdomen, and checking the gums and hydration. These steps cannot be done remotely. The veterinarian may recommend bloodwork to check liver and kidney function, since many sedating medications are processed by those organs. They may adjust the dose, change the medication, or add a medication to manage side effects.

The cost of a visit depends on your region, the clinic, and whether bloodwork is needed. A basic office visit might range from 50 to 150 dollars. Bloodwork can add 100 to 300 dollars. Emergency or after-hours care costs more, sometimes substantially. These are general ranges only. Prices vary widely by region and clinic, so ask for an estimate before agreeing to tests.

When an Online Vet Can Help, and When It Cannot

Some situations in this article require hands-on care. If your dog cannot be woken, has trouble breathing, has pale or blue gums, collapses, or has a seizure, you must go to an emergency clinic in person. Do not use a video call for these signs. No remote consultation can examine a dog that is unconscious or struggling to breathe.

For milder situations, an online consultation can be genuinely useful. If your dog is sleepy but otherwise stable, a remote vet can take a detailed history, watch your dog on video, and advise whether the sleepiness is within the expected range. They can help you decide if a sign warrants an in-person visit. They can answer questions about a known medication side effect or follow up on a chronic condition.

A remote vet can do many things, but they cannot do everything. They cannot feel your dog's abdomen, listen to the chest with a stethoscope, take a temperature, run bloodwork, or perform imaging. They can see visible signs on video, such as breathing effort, gum color, and whether your dog can stand. Prescribing rules differ by state, and a remote veterinarian may require an in-person examination before prescribing or changing a medication. The MSD Veterinary Manual for pet owners explains why a physical examination is often necessary to make a safe diagnosis. Use online care for triage and advice, not as a replacement for hands-on medicine when your dog needs it.

Common Mistakes Owners Make With a Sleepy Dog

When a dog seems overly tired after starting a new medication, owners often react in one of two ways. Some assume the sleepiness is harmless and ignore it completely. Others panic and stop the drug without calling anyone. Both approaches carry risk.

The most common mistake is stopping a medication cold turkey. Some drugs, especially those used for anxiety or seizures, can cause withdrawal effects or a rebound of the original problem if stopped suddenly. If your dog was on a sedative for storm anxiety and you stop it abruptly, the next storm may cause a worse reaction than before.

Another frequent error is giving the next dose early because the dog seems "off." This can lead to over-sedation. The opposite mistake is skipping doses because the dog is sleepy, which can leave a painful or anxious condition untreated.

Owners also confuse normal sleepiness with a serious problem, or the reverse. They may not know what "too sleepy" actually looks like. A dog that is drowsy but responds to their name is different from a dog that cannot be roused.

Finally, some owners try to adjust the dose themselves, splitting pills or giving extra. The FDA warns that dosing errors are a leading cause of medication problems in pets. Your veterinarian calculated the dose based on your dog's weight, health conditions, and the specific drug. Only your veterinarian can safely change it.

Common Mistake	What to Do Instead
Stopping the drug suddenly	Call your veterinarian first. They may advise a gradual taper.
Giving the next dose early	Stick to the exact schedule your veterinarian gave you.
Skipping doses because the dog is sleepy	Report the sleepiness, but keep the schedule unless told otherwise.
Splitting or crushing pills to adjust dose	Never alter a dose. Ask your veterinarian for guidance.
Waiting days to report severe lethargy	Call the same day if the dog is hard to wake or not eating.

How to Reduce the Chance of It Happening Again

Sleepiness from medication is often expected, but you can take steps to manage it well. Before starting any new drug, ask your veterinarian what side effects to expect and how long they usually last. Write down the answer.

Give the first dose at a time when you can watch your dog for a few hours. A weekend morning is often better than a weeknight before bed. This lets you see how your dog reacts while you are awake and available.

Keep a simple log. Write down the time of each dose, how sleepy your dog seems on a scale of 1 to 10, and whether they eat, drink, and walk normally. This record is gold when you call your veterinarian. They can see patterns, such as sleepiness peaking two hours after each dose.

If your dog is on a medication for anxiety or pain, ask if there is a lower starting dose or an alternative drug with fewer sedative effects. Some dogs do better on one drug than another. The American Veterinary Medical Association notes that working closely with your veterinarian is the safest way to adjust any treatment plan.

Do not give your dog any other medication, including over-the-counter products or supplements, without asking. Drug interactions can increase sedation or cause new problems.

What Recovery and Ongoing Management Usually Look Like

Most medication-related sleepiness fades within a few days to two weeks. The body often adjusts to the drug, and the drowsiness becomes less noticeable. This is called tolerance. Your dog may still sleep more than usual, but they should be bright and responsive when awake.

Some dogs need a dose adjustment after the first week. Your veterinarian may lower the dose, change the timing, or switch to a different medication. This is normal and not a failure. The goal is the best effect with the fewest side effects.

If the sleepiness is from a short-term drug, such as a sedative given before a vet visit, your dog should be back to normal within 24 hours. If it is from a daily medication, expect a longer adjustment period.

Watch for these signs during the adjustment phase. Your dog should eat and drink normally. They should be able to walk without stumbling. They should respond to your voice and touch. If any of these are not true, call your veterinarian.

Ongoing management means staying in touch. Your veterinarian may want a check-in call after a week. Some clinics offer a recheck visit to assess how the drug is working. The American Animal Hospital Association recommends regular veterinary visits to monitor long-term medication use.

Frequently Asked Questions

My dog has been sleeping all day since starting gabapentin. Is this normal?

Gabapentin is known to cause sleepiness, especially in the first few days. Many dogs sleep more than usual and seem groggy. This often improves within a week as the body adjusts. The key is whether your dog wakes up normally when called, eats, drinks, and walks without stumbling. If they do, the sleepiness is likely an expected side effect. If they are hard to wake or refuse food for more than 24 hours, call your veterinarian.

Can I give my dog coffee or another stimulant to wake them up?

No. Never give your dog caffeine, energy drinks, or any human stimulant. These can cause dangerous heart problems, agitation, and seizures. The sleepiness from medication is temporary and should not be fought with stimulants. If you are worried about how sleepy your dog is, call your veterinarian. They may adjust the dose or timing instead.

How long will trazodone make my dog sleepy?

Trazodone's sedative effect usually peaks within a few hours of the dose and fades over 8 to 12 hours. Some dogs are sleepy for a full day after their first dose. With daily use, the drowsiness often lessens after a few days. If your dog is still very sleepy after one week, or if they cannot stand or eat, contact your veterinarian. They may lower the dose or suggest giving it only at night.

Should I wake my dog up to eat and drink?

Yes, within reason. Offer food and water every few hours during the first day or two. A sleepy dog may not get up on their own, but they should eat when offered. If your dog refuses food for more than 24 hours or will not drink water, call your veterinarian. Dehydration and low blood sugar can develop quickly in a dog that is not eating.

What if my dog seems more sleepy each day instead of less?

This is a warning sign. Sleepiness should gradually improve, not worsen. If your dog is more lethargic on day three than day one, call your veterinarian the same day. This could mean the dose is too high, the drug is building up in the body, or something else is going on. Do not wait to see if it passes.

Can I give the medication with food to reduce sleepiness?

Giving medication with food can reduce stomach upset, but it may not change sleepiness. Some drugs are absorbed differently with food, which can affect how strong the sedative effect is. Your veterinarian should have told you whether to give the drug with food. If they did not, ask. Do not change how you give the drug without checking first.

Related Clinical & Scientific Guides

References and Further Reading

This article is general educational information for pet owners. It is not a substitute for veterinary diagnosis, examination, or treatment. If your pet is showing severe or rapidly worsening signs, contact an emergency veterinary hospital immediately.