Dogs should only be given aspirin under the strict supervision of a veterinarian, according to PetMD. Aspirin overdoses can cause vomiting, diarrhea and intestinal hemorrhage.
Dogs can be given 5 to 10 milligrams of aspirin per pound of body weight once over a 12-hour period, according to VetInfo. Aspirin is toxic to dogs in doses of 30 milligrams per pound, and should never be given to puppies. Dogs cannot digest coated aspirin.
Carprofen, deracoxib and etodolac are three animal-specific pain relievers that veterinarians may prescribe for pain relief, according to WebMD. Unlike aspirin, these pain relievers are intended for animal use. Aspirins for human use are too strong for dogs, according to VetInfo.