Rimadyl Toxicity Dose. If you accidentally gave your dog a double dose of rimadyl, you should immediately contact your vet with no exceptions. Alternatives to rimadyl for dogs.
Even at the lowest rimadyl dosage there are possible side effects, and for some dogs even a small overdose can be toxic. Never underestimate the seriousness of a rimadyl overdose in your dog—taken in large amounts or in conjunction with certain other medications, including aspirin, rimadyl is very toxic and will cause liver and kidney failure, gastrointestinal. As long as doses have a potency of 22 mg/kg, dogs may become toxic.