Dogs can also be retarded. This happens due to the above-mentioned conditions. Some of the signs and symptoms that a dog is retarded are inability to communicate effectively with the owner and other dogs, lack of concentration, inability to walk or run properly, and funny-looking physical appearance among others. If you feel off about how your dog is behaving then you need to run to the pet clinic and seek help. The problem should be managed at the time that you have detected it to avoid even further complications.