If you think your dog may have had a stroke, there are several things you can look for. First, check for sudden changes in your dog’s behavior or appearance. This may include paralysis, weakness, loss of balance, and vision problems.
Dr. Sinott via PetMD explains that one minute owners report the pet is fine, and the next [the pet] cannot get up. These signs may last a few minutes or longer (hours to days).
Dr. Sinott says that the signs may be frightening and associated with dog discomfort, and some owners elect to euthanize their pets.
You may also notice that your dog is having trouble eating or drinking or that he is drooling more than usual. If you see any of these signs, take your dog to the vet immediately. A stroke is a severe medical emergency, and the sooner your dog is treated, the better his chances for recovery.