Cyclobenzaprine, often used in management of acute muscle spasms, is almost completely absorbed after an oral dose, with peak plasma levels in 3–8 hr. It has extensive liver metabolism and undergoes enterohepatic recirculation. The most common signs seen in dogs and cats include depression and ataxia.Click to see full answer. Then, what muscle relaxer can I give my dog?Methocarbamol is an oral medication prescribed by veterinarians to help treat muscle spasms in dogs and cats. More specifically, this relaxant is used to treat muscle spasms caused by acute inflammation, as well as traumatic conditions, or spasms occurring from poisoning.Likewise, is Flexeril a benzo? Flexeril is a muscle relaxant and Xanax is a benzodiazepine. Also question is, will a muscle relaxer kill a dog? Muscle relaxants – can impair the central nervous system and lead to death.What human medications can kill a dog? 10 human pills that can harm — or even kill — your pets Ibuprofen: Also sold as Advil® and Motrin®, this is the most common human drug ingested by pets. Tramadol: Also sold as Ultram®, this is a pain reliever. Alprazolam: Also sold as Xanax®, this is prescribed as an anti-anxiety medication and a sleep-aid.