Does Carprofen Make Dogs Sleepy?
Published 2026-10-01 · Updated 2026-10-02
Yes, lethargy is a recognised side effect of carprofen, and it is one of the more commonly reported ones. Most of the time it is mild and settles within a few days. But sleepiness is also an early sign of the serious problems carprofen can cause, so it is worth knowing which is which.
Why Carprofen Can Make a Dog Sleepy
Carprofen is not a sedative — it has no direct sedative action. Sleepiness on carprofen usually comes from one of three places:
- The dog is finally comfortable. A dog in chronic arthritis pain sleeps badly. Take the pain away and they often sleep deeply for several days, catching up. Owners read this as sedation when it is actually recovery.
- Mild drug intolerance. Some dogs feel a bit flat on an NSAID, often alongside a slightly reduced appetite. This is the recognised side effect, and it commonly settles.
- Something is going wrong. Lethargy is also an early sign of gastrointestinal bleeding, liver injury or kidney trouble — the serious NSAID risks.
Normal Quiet vs a Warning Sign
The distinction is less about how sleepy the dog is and more about what comes with it, and which direction it is heading.
| Usually not concerning | Call your vet |
|---|---|
| Sleeping more but rouses normally and greets you | Hard to rouse, or uninterested in people and food |
| Eating normally | Appetite has stopped |
| Settles over the first week | Getting worse day by day |
| No other symptoms | Vomiting, diarrhea, black or tarry stool |
| Normal gum colour | Pale, yellow or tacky gums |
| Normal drinking | Drinking or urinating noticeably more |
Lethargy combined with vomiting, black or tarry stool, yellowing gums or eyes, or increased drinking is not a side effect to monitor at home. Contact your vet. These point to the gastrointestinal, liver and kidney effects described in our carprofen side effects guide.
Does It Wear Off?
For most dogs, yes. Mild flatness in the first few days commonly settles as the dog adjusts. If it has not improved after about a week, or if it started later in a long course rather than at the beginning, that is worth a conversation with your vet rather than continued watching — a change that appears after months on a stable dose is more likely to reflect something new.
Does Rimadyl Make Dogs Sleepy Too?
Rimadyl is carprofen, so yes, identically. The same applies to Novox, Vetprofen, Carprovet and every other brand — they contain the same drug, so they share the same side effects. Switching brands does not avoid this; see carprofen vs Rimadyl.
What to Do
- Do not stop the medication on your own if your dog is mid-course after surgery — call your vet first, as untreated post-operative pain has its own costs.
- Note what you are seeing: when it started, whether it is improving or worsening, appetite, stool, drinking.
- Check the dose. Confirm the strength and frequency match the label, especially if more than one person in the household gives medication — see overdose signs.
- Ask about bloodwork if the lethargy persists; see bloodwork monitoring.
Frequently Asked Questions
Does carprofen make dogs sleepy?
Lethargy is a recognised side effect of carprofen and one of the more commonly reported ones. It is often mild and settles within a few days, but because sleepiness is also an early sign of gastrointestinal, liver or kidney problems, worsening or severe lethargy warrants a call to your vet.
How long does carprofen sleepiness last?
For most dogs, mild flatness settles within the first week as they adjust. Lethargy that persists beyond that, worsens, or appears suddenly after months on a stable dose should be assessed by your vet.
Is my dog sleepy from carprofen or just pain-free?
Both are common. A dog in chronic pain sleeps poorly, so pain relief often produces several days of deep catch-up sleep. The reassuring version rouses normally, eats normally and has no other symptoms.
Does Rimadyl make dogs tired?
Yes, identically — Rimadyl is carprofen. All carprofen brands share the same side-effect profile, so switching brands does not avoid it.
Should I stop carprofen if my dog is sleepy?
Do not stop on your own, particularly mid-course after surgery. Call your vet, who can judge whether to continue, adjust or investigate.