English Bull Terrier Temperament. English Bull Terriers are renowned for being bullied, and therefore it is not the ideal dog for a first-time dog owner. Their physical strength is match by their intelligence, so you’ll have a very reliable and intelligent, as well as physically dominating pet. Their minds and bodies need to be kept active through play. The English Bull Terriers are no more aggressive than other dogs, but it is not your average dog. As English Bull Terriers are such a mentally and physically strong breed, they need to be given strict regiment of leadership and discipline from the first day of ownership. Even though English Bull Terriers might seem naughty and mischievous, it is extremely important to monitor any signs of aggression, even in the first 6 months of their lives. Proper training and discipline are need to keep these dogs in check.