Can you give a 30 pound dog an aspirin for foot pain?

No - dogs should never be given human pain medications (Tylenol, aspirin, Advil, Aleve, Motrin, ibuprofen, etc.). Dogs are very sensitive to the side effects, which can be fatal.

If you believe your dog would benefit from pain medication, you will need to make an appointment with your veterinarian for an examination. There are safe pain medications available for dogs, but you need a veterinary prescription to get them.