Carprofen for Cats
Carprofen is approved in the U.S. primarily for dogs. Cats metabolize NSAIDs much more slowly and are significantly more sensitive to their side effects, particularly on the kidneys. Carprofen should never be given to a cat except under direct, carefully dosed veterinary supervision — and even then, typically only as a single injectable dose for short-term post-surgical pain, not for ongoing oral use.
Why Carprofen Is Rarely Recommended for Cats
Cats lack some of the liver enzyme pathways (specifically certain glucuronidation pathways) that dogs and humans use to clear NSAIDs efficiently, so the drug stays active in a cat's system much longer. This raises the risk of toxicity, especially to the kidneys and gastrointestinal tract, even at doses that would be routine for a dog of similar weight. A dosing schedule that's perfectly safe once a day for a dog could accumulate to dangerous levels in a cat given even every other day.
Historically, injectable carprofen was used off-label in cats for single-dose post-operative pain control, but repeated or oral dosing in cats is generally avoided in favor of NSAIDs specifically studied and approved for feline use, or non-NSAID pain control options. If your cat is currently prescribed any form of carprofen, that decision should always sit with a vet who has weighed the specific risk-benefit for your cat's situation — this page explains the general reasoning, not a recommendation either way.
What Makes Feline NSAID Dosing So Different
The core issue is pharmacokinetics — how a drug moves through and out of the body. In dogs, carprofen has a relatively short half-life, meaning it clears from the bloodstream fairly efficiently between doses. In cats, that same half-life can stretch dramatically longer and vary significantly between individual cats, making a "standard" repeat dosing schedule unpredictable and risky. This is also why you may see carprofen and other canine NSAIDs used in cats only as a single carefully calculated dose in a clinical setting, rather than as a bottle of tablets sent home for repeated use, the way a dog's prescription typically works.
Signs of NSAID Toxicity in Cats
- Vomiting or loss of appetite
- Lethargy
- Increased or decreased urination
- Black, tarry stool
- Signs of abdominal pain
- Drooling or apparent mouth pain (can indicate GI ulceration)
If your cat has ingested carprofen accidentally — for example, a dose meant for a household dog — contact your vet or an animal poison control hotline immediately, even if your cat seems fine. Toxicity signs in cats can take time to become obvious, and by the time they appear, meaningful kidney injury may already be underway. Don't wait for symptoms before calling.
If You Have Both a Dog and a Cat in the House
Multi-pet households are actually where a lot of accidental feline NSAID exposure happens — a chewable, flavored tablet meant for the dog left on a counter, a pill pocket dropped and not noticed, or a cat investigating a pill organizer. Store any dog's carprofen (or Rimadyl, Novox, Vetprofen, Carprovet, or other carprofen product) in a genuinely cat-inaccessible place, and never assume a cat "probably won't bother with it" — the same flavoring that makes it easy to give a dog can make it appealing to a cat too.
Safer Pain Management Options for Cats
If your cat needs pain relief for arthritis or after surgery, ask your vet about feline-specific options, which may include NSAIDs formulated and approved for cats, other prescription pain medications, or non-drug approaches like weight management and environmental modification for arthritis (ramps, low-sided litter boxes, soft bedding). Never give a cat leftover dog medication, and never assume that because a drug is safe for your dog, it's safe for your cat at a scaled-down dose — the difference isn't just about size.
Frequently Asked Questions
Can I give my cat carprofen for pain?
Only under direct veterinary supervision, and generally only as a single carefully calculated dose for short-term use. Long-term or repeated oral dosing in cats is not standard practice due to toxicity risk.
What should I do if my cat accidentally ate a dog's carprofen tablet?
Contact your vet or an animal poison control hotline immediately, even if your cat isn't showing symptoms yet — NSAID toxicity in cats can take time to appear.
Why can dogs take carprofen safely but cats can't?
Cats process NSAIDs through different, slower metabolic pathways than dogs, so the drug can accumulate to dangerous levels with repeated dosing even when the per-dose amount looks similar.
Are there NSAIDs that are actually approved for cats?
Some NSAIDs have specific feline-approved formulations and dosing regimens for short-term use — ask your vet which options are appropriate and approved for your cat's specific situation rather than assuming any dog NSAID can be adapted.