It is in our nature to protect our pets from pain. Always check with your veterinarian before giving any over-the-counter medications. Aspirin is now being marketed to dog owners as a way to help with everyday aches and pains. The truth is that once you have given aspirin to your dog, your veterinarian is very limited in which medications they can prescribe due to numerous drug interactions. Also, just one dose of aspirin has been shown to cause erosions of the lining of the stomach. In addition, drugs like Aleve and Ibuprofen can cause kidney failure at regular human doses. Cats are extremely sensitive to non-steroidal anti-inflammatories and Tylenol and it takes very little to harm your pet. Unless your doctor has recommended it, do not give any over-the-counter medications to your pet.