Bull Terriers were initially bred as fighting and vermin hunting dogs. As their name suggests, they are a combination of a Bulldog and a Terrier, and as such they are brimming with strength and energy. If you want your dog to behave as he should, you have to treat it properly and make sure that his needs are satisfied.
Even though they are quite energetic, they won’t need a lot of planned exercise. They are usually able to spend their energy just running around the house, playing with the people around him and usually also jumping on them, so if you or anyone in your family is not comfortable with this, Bull Terrier might not be a perfect choice for you. But this doesn’t mean that you shouldn’t take him out for a walk as often as you can. Although, when walking your Bull Terrier, you might want to use the leash at all times as they can be hostile when they meet other dogs.
If they are inactive for a long time they might get lazy, and if you don’t adjust their diet to their new exercise regime, also quite fat. But that is just the better of two options. The other one is that they can get rather destructive if they are left without an activity to occupy their mind and body. If you leave your Bull Terrier without means of spending his energy he might become bored and restless and start chewing on everything he finds. If you notice that your dog’s behavior has suddenly become unbearable, this might be the cause.
As far as training goes, the earlier you can begin the better. Their history as fighting dogs has made them suspicious of other dogs, which might be a problem. If you want to breed this impulse out of them as far as it is possible, you will want to help them socialize as much as they can with other dogs while they are still young. This might make them more accepting of other dogs in their vicinity, but you should always have Bull Terrier’s nature in mind, and never forget their strong instincts.
You will probably need to teach your dog to sit first, as this will help you get over the jumping problem. A lot of people use Bull Terrier training and exercise methods that put them in direct “confrontation” with the dog, such as playing tug of war with him. This might not be the best idea, as the dog might develop domination issues. Instead, let him get his exercise while he is learning to perform the commands.
Always use positive reinforcement as the default training method. Once you get your dog to sit or fetch or whatever it is that you want to teach him to do, reward him with a kind word and a treat. Don’t physically punish your dog, it will only drive a wedge between the two you and make the training all that harder. You want him to respect you, not fear you, even though the dog must know that you and your family members are above him in the “pack hierarchy” he shouldn’t be abused to be made aware of his place.