Our expert says:
The problem is genetics! Bull terriers and Pit bull terriers have been selectively bred for fighting other dogs and so this is genetically programmed into them. Sometimes it is possible to avoid this by socialising (from 8 weeks old with all types of dogs) and castrating a male terrier, but often even these measures are not enough to outdo the genetic makeup, as you see with your dog. He is obviously also quite a dominant male and perhaps if you had neutered the other (less dominant?) one and kept him entire things may have been better. Usually one neuters the less dominant of two males to increase the status difference. Urinating to mark territory is quite common in neutered males and sometimes even bitches cock their legs! He is obviously constantly trying to assert his leadership on your property, which has to do with the other male dog and the bitches (especially if they are on heat!). Taking him for regular walks where he can cock his leg outside his territory may help. You may also consider hormone treatment (e.g. Ovarid), which may or may not help. Otherwise separating him from the other male dog may be the only solution, if you want to avoid dog fights.
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