Mental confusion or a glazed expression. Housebreaking accidents - Loss of bladder or bowel control in a dog that was previously housebroken. Appetite - You dog may lose his desire to eat. On the other hand, he may become ravenous. He may also forget what is edible and what is not.
Some dogs lose their sight, their hearing or even their sense of smell.
Seizures generally become worse as the tumor gets larger. If the tumor is not treated, seizures become more and more difficult to control as the disease progresses. The dog seems to tire more rapidly during exercise, and may lack the energy to play as he or she used to. Pain - The dog may whine, whimper or even yipe without apparent reason. He may shake or scratch his head or rub it against objects.