http://www.oc-bullterrierclub.com/healthy_bt.htmNeurological/Behavioral Peculiarities
Some Bull Terriers chase their tails. In the mild form, this seems to be related to boredom or to stress of some kind. Some spin around in circles a few times when they are excited. Usually this is not a serious problem and can be remedied by removing the cause of the boredom and stress.
Spinning
A much more serious form of tail chasing is called spinning. This usually begins at about 6 months of age. The dog is obsessed by its tail and may circle for hours. It loses interest in food and water. All attempts to get the dog to stop this behavior fail. Sometimes the dog yelps while spinning and may even attempt to bite its interfering owner. In the past, most of
these spinners were eventually put down. Even amputating the tail does not help! Over the past few years, a research project at Tufts University School of Veterinary Medicine suggests that spinning is form of seizure. Most spinning dogs respond to treatment with phenobarbital either alone or in conjunction with other medications. Some of the less severe cases do well on anti-obsessive drugs such as Anafranil or Prozak. It is interesting that treatment of spinning Bull Terriers has been more successful in females than males.
Rage
Incidents of unexplained aggression toward human members of its own family by a dog which usually behaves normally may signify rage. A Bull Terrier with rage is an extremely frightening and dangerous dog. The episodes are usually unpredictable. Some owners claim that the dog gets a glazed look in its eyes before a "spell". Rage is presently considered to be another seizure-type disorder. Some of the severe spinners develop rage-like symptoms as the spinning becomes worse. Prognosis is poor. It is important not to confuse dominance aggression with rage. Whereas dominance aggression is a behavioral problem which can often be overcome by correct training and proper handling, rage is apparently a neurological dysfunction which does not seem to respond to training.
Epilepsy
A few Bull Terriers develop grand mal type epileptic seizures. If a dog has the form of epilepsy which seems to be inherited, seizures usually begin between the ages of 6 to 18 months. Although the seizures may be controlled somewhat by medication, the prognosis is not good. Affected Bull Terriers seem to survive only a year or two after onset of the disease. Also, prolonged dosage with the drug phenobarbital may cause severe liver damage which is fatal.