Carprofen Side Effects: Diarrhea, Vomiting and Panting
Published 2026-10-01 · Updated 2026-10-02
Digestive upset is the most common carprofen side effect, and panting is one of the most frequently reported but least specific. Each can be minor. Each can also be the first visible sign of something that needs treating today. The difference is usually in the detail.
Diarrhea on Carprofen
Soft stool is a recognised and relatively common effect, often appearing in the first days and settling. Giving the tablet with food helps some dogs. What changes the picture entirely is the appearance of the stool.
Black, tarry or sticky stool means digested blood, which points to bleeding higher in the gastrointestinal tract — the ulceration NSAIDs can cause. Bright red blood also warrants a call. Neither is a wait-and-see situation: contact your vet the same day.
Ordinary soft stool with a normal colour, in a dog who is otherwise bright and eating, is the version that commonly settles. Persistent diarrhea beyond a couple of days still deserves a call, because a dog losing fluid gets dehydrated, and dehydration raises the kidney risk of any NSAID.
Vomiting on Carprofen
An occasional single vomit early in a course, in a dog who is otherwise well and eating, is the common mild version. Repeated vomiting is not. Nor is vomit containing blood, or material that looks like coffee grounds — that appearance is digested blood and means the same thing as tarry stool.
A practical trap: if your dog vomits shortly after a dose, do not simply give another tablet. You cannot know how much was absorbed, and re-dosing is a common route to accidental overdose. Call your vet's office and ask — see overdose signs.
Panting on Carprofen
Panting is the one owners search for most and the hardest to interpret, because dogs pant for many ordinary reasons: heat, excitement, exertion, stress. Carprofen is not a drug that characteristically causes panting the way, say, a steroid does.
What makes panting worth attention is context. Panting in a cool, resting dog that has not exerted itself, particularly alongside restlessness, a hunched posture, pale gums or reluctance to lie down, can indicate pain or abdominal discomfort rather than a simple side effect. Panting with pale or yellow gums needs a vet now.
It is also worth remembering why the dog is on carprofen. A dog panting because arthritis pain is undertreated is telling you something different from a dog panting as a drug reaction, and both are reasons to speak to your vet rather than to assume.
Quick Reference
| Sign | Often minor | Call your vet |
|---|---|---|
| Diarrhea | Soft, normal colour, dog bright and eating | Black, tarry, bloody, or lasting more than a day or two |
| Vomiting | A single episode, dog otherwise well | Repeated, bloody, or coffee-ground appearance |
| Panting | After exertion, heat or excitement | At rest in a cool room, with restlessness, pale gums or hunching |
Reducing the Risk
- Give with food if your dog is prone to stomach upset
- Keep fresh water available — dehydration compounds NSAID kidney risk
- Never combine with another NSAID or a steroid unless your vet planned it — see drug interactions
- Keep up bloodwork for long-term use — see bloodwork monitoring
Frequently Asked Questions
Can carprofen cause diarrhea in dogs?
Yes. Soft stool is one of the more common carprofen side effects and often settles within a few days, particularly if the tablet is given with food. Black, tarry or bloody stool is different — it suggests gastrointestinal bleeding and needs same-day veterinary attention.
Does carprofen cause panting in dogs?
Panting is frequently reported but is not a characteristic carprofen effect, and dogs pant for many ordinary reasons. Panting in a cool, resting dog alongside restlessness, hunching or pale gums can indicate pain or discomfort and should be assessed.
My dog vomited after carprofen — should I give another tablet?
No. You cannot know how much was absorbed, and re-dosing is a common route to accidental overdose. Call your vet's office and ask.
Is it normal for a dog to have an upset stomach on carprofen?
Mild, short-lived digestive upset is recognised and relatively common. Repeated vomiting, blood, or stool that is black or tarry is not, and needs prompt veterinary attention.
Does giving carprofen with food help?
It can reduce stomach upset in dogs that are prone to it, and carprofen can be given with or without food. Consistency of timing matters more than whether food is involved.