Benazepril for Dogs: Weight-Based Dosage

Name: Benazepril for Dogs: Weight-Based Dosage
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Benazepril is an ACE inhibitor that veterinarians prescribe for dogs with heart disease, and the dose is calculated from your dog's body weight, usually given once or twice daily. Your veterinarian sets the exact dose, so use the numbers below as a reference point, not a prescription.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Benazepril dosing is weight based.
The same total daily amount is often split into two doses, roughly 12 hours apart, because the drug's effect on the body's hormone system does not last a full 24 hours at the lower dose [1][2].

A 10 lb dog and a 60 lb dog need very different amounts.

Give the medicine with or without food at the same times each day. If you miss a dose, give it when you remember unless it is almost time for the next one, then skip it and get back on schedule.
Never change the dose, stop the drug, or add a new medicine on your own. Call your veterinarian first.

What Benazepril Is and What Veterinarians Use It For

Benazepril belongs to a drug class called angiotensin-converting enzyme inhibitors, or ACE inhibitors. In dogs, these drugs are prescribed most often for heart disease, including congestive heart failure and the valve disease that leads to it [1][2]. They are also used in some dogs with high blood pressure or certain kidney problems.

The drug comes as a tablet you give by mouth. It is sometimes sold as a single-ingredient product and sometimes combined with another medicine called spironolactone in one tablet [2]. Your veterinarian will tell you which form your dog is getting.

If your dog is also on other heart medications, the plan may look complex. A common companion drug is pimobendan, and you can read more about how that one is dosed in our guide to the Pimobendan Vetmedin Cardiac Dose: Weight-Based CHF Dog Dosing Chart.

How Benazepril Works

Your dog's body has a hormone system called the renin-angiotensin-aldosterone system, or RAAS. When the heart is failing or blood pressure is off, this system can become overactive and make the heart work harder. It tightens blood vessels and causes the body to hold onto salt and water.

Benazepril blocks one step in that system. The drug itself is not the active form. The liver converts it into a metabolite called benazeprilat, and that is what does the work [1]. By blocking the enzyme, the drug helps blood vessels relax and reduces the workload on the heart.

Researchers can measure how well the drug is working by checking blood markers of RAAS activity. In healthy dogs, higher doses of benazepril produced larger changes in those markers than lower doses did [1]. That dose-dependent effect is one reason veterinarians sometimes adjust the amount over time.

Benazepril for Dogs Dosage Chart by Weight: The Basics

Here is the part most owners want first. The dose is based on body weight, and the veterinarian does the math.

Who decides the dose

Only your veterinarian decides the dose. They weigh your dog, review the diagnosis, check kidney values and blood pressure, and look at every other medicine your dog takes. The number they choose may differ from any general figure you read online, and that is normal and expected.

The reference dose

In veterinary research, benazepril has been studied at 0.125 mg/kg, 0.25 mg/kg, and 0.5 mg/kg in dogs [1]. The 0.25 mg/kg amount is the one most often described as the standard or label dose, and it is the figure used in a fixed-dose combination product study as well [2].

A 10 lb dog would need only a fraction of that tablet, and a 90 lb dog would need more than one. This is why a single tablet size cannot serve every dog, and why you should not use a friend's leftover tablets for your own pet.

Why the dose is often split twice daily

Benazepril's effect on RAAS markers does not stay flat for a full 24 hours at the lower dose. In one study, researchers measured those markers over a 12 hour window after dosing and found the higher dose produced lower time-weighted average values than the lowest dose [1]. A follow-up study tested the same drug given once daily versus twice daily and found that the twice-daily schedule changed the hormone markers more than the once-daily label dose did [2].

That is the practical reason many veterinarians split the total daily amount into two doses about 12 hours apart. It keeps steady pressure on the hormone system instead of letting it rebound between doses. Your veterinarian will tell you whether your dog is on once-daily or twice-daily dosing.

How to give it

Give benazepril by mouth, with or without food, at the same times each day. Pill pockets, a small piece of cheese, or a soft treat all work if your dog is food motivated. If your dog refuses the tablet, ask your veterinarian before crushing it, because some products should not be split or crushed.

What to do about a missed dose

If you miss a dose, give it as soon as you remember, unless the next dose is almost due. In that case, skip the missed dose and go back to your normal schedule. Do not double up to catch up. If you miss several doses in a row, call your veterinarian for guidance instead of guessing.

Common and Serious Side Effects

Most dogs tolerate benazepril well, but side effects can happen. The table below separates the ones owners see often from the ones that need a phone call.

Side effect	How common or serious	What to do
Tiredness or lower energy	Common, usually mild	Note it and mention it at the next visit. Call if it lasts more than a day or two.
Stomach upset, vomiting, or loose stool	Common, usually mild	Give with a small meal if your vet approves. Call if it continues or your dog stops eating.
Weakness, wobbliness, or fainting	Less common, serious	Call your veterinarian the same day.
Very low blood pressure	Uncommon, serious	Emergency. Call now if your dog collapses or cannot stand.
Kidney values that get worse on bloodwork	Uncommon, found on testing	Your vet monitors for this. Keep scheduled recheck appointments.
Swelling of the face, hives, or trouble breathing	Rare, serious	Emergency. Seek care immediately.

Because benazepril lowers blood pressure, some dogs on other heart drugs can become too relaxed or unsteady. If your dog seems "drunk" or unusually weak after a dose, that is a reason to call, not wait.

Who Should Not Take Benazepril and What Interacts With It

Benazepril is not right for every dog. Your veterinarian will avoid it or use it with extra caution in dogs with certain conditions.

Dogs who may not be good candidates

Dogs with known sensitivity to ACE inhibitors.
Dogs with severely reduced kidney function, unless the veterinarian decides the benefit outweighs the risk and monitors closely.
Dogs that are dehydrated, vomiting, or not eating well.
Pregnant or nursing dogs, unless the veterinarian specifically recommends it.
Puppies, whose dosing and safety are less established.

Medicines and supplements that can interact

Tell your veterinarian about everything your dog takes, including over-the-counter products. Several drug types can interact with benazepril:

Diuretics such as furosemide, which can add to blood pressure lowering.
Other blood pressure medicines.
Nonsteroidal anti-inflammatory drugs (NSAIDs) for pain, which can stress the kidneys when combined with an ACE inhibitor.
Potassium supplements or potassium-sparing diuretics, because benazepril can raise potassium levels.
Spironolactone, which is sometimes combined with benazepril on purpose in one tablet, so your vet needs to know if your dog is on both separately [2].

If your dog is on an antibiotic for an unrelated infection, that is usually fine, but still mention it. Our guide to the Amoxicillin Dog Cat Dose: Broad-Spectrum Antibiotic Weight-Based Guide explains how those drugs are dosed by weight, and the same principle applies here: every drug has its own math.

Overdose: What to Do and When to Call

An overdose of benazepril can cause a dangerous drop in blood pressure, weakness, fainting, or collapse. It can also affect kidney function.

If you think your dog got too much:

Do not wait for symptoms. Call your veterinarian or an emergency clinic right away.
If your regular vet is closed, call a pet poison hotline. The ASPCA Animal Poison Control Center is available at (888) 426-4435, and the Pet Poison Helpline is available at (855) 764-7661. A consultation fee may apply.
Bring the pill bottle with you so the team knows the strength and how many tablets are missing.
Do not try to make your dog vomit unless a veterinarian tells you to.

Signs that need emergency care now include collapse, extreme weakness, pale gums, a very slow or racing heart, or trouble breathing. Even if your dog seems fine, a large accidental dose still needs a call, because blood pressure can fall over the next few hours.

Limitations and When to Contact a Veterinarian

This article gives general information, not a prescription. Every dog is different, and only your veterinarian can decide the right dose for your dog based on weight, diagnosis, lab work, and other medications.

Call your veterinarian the same day if:

Your dog vomits, has diarrhea, or refuses food for more than a day.
Your dog seems more tired or weaker than usual.
You missed more than one dose and are unsure how to restart.
You ran out of medication and need a refill before the next dose is due.

Go to an emergency clinic now if:

Your dog collapses, faints, or cannot stand.
Your dog has trouble breathing or its gums look pale or white.
You suspect a large overdose, even if your dog looks normal.
Your dog's face swells or it breaks out in hives.

Keep routine recheck visits, even when your dog seems well. Heart disease and blood pressure problems change over time, and the dose that worked six months ago may not be the right one now. Bloodwork and blood pressure checks are how your veterinarian catches those changes early.

Frequently Asked Questions

Can I split a benazepril tablet to get the right dose?

Sometimes, but only if your veterinarian says so. Some tablets are scored and meant to be split, while others are not, and splitting can change how much drug your dog actually gets. Ask before you break any pill.

Is benazepril the same as enalapril?

They are in the same drug class and work in a similar way, but they are different medications with different dosing. Do not swap one for the other on your own. Your veterinarian chose benazepril for a reason.

How long does it take to see a difference in my dog?

Some effects on blood pressure and the heart can show up within days to weeks, while changes in heart size and symptoms take longer. Your veterinarian will set recheck timing based on your dog's condition.

Can I give benazepril with food?

Yes, it can be given with or without food. If your dog gets an upset stomach on an empty stomach, a small meal or treat around the dose often helps. Ask your vet if you are unsure.

What if my dog seems fine and I want to stop the medicine?

Do not stop on your own. Benazepril is usually a long-term medicine, and stopping suddenly can let the hormone system rebound and make heart symptoms worse. Call your veterinarian if you have concerns about cost, side effects, or how the medicine is working.

References

Dose-response of benazepril on biomarkers of the classical and alternative pathways of the renin-angiotensin-aldosterone system in dogs. Scientific reports, 2023.
Dose-exposure-response of CARDALIS® (benazepril/spironolactone) on the classical and alternative arms of the renin-angiotensin-aldosterone system in healthy dogs. Journal of veterinary internal medicine, 2025.