Shoot, all of the reasons I hate Brian are already taken, but I will try to go at it.
85. He made out with his best friend's wife. (this already might be taken, but I have no time to read all posts)
86. He claims he knows everything, and already acclaims how good of an individual he is, but does not act upon on anything he praises himself for.
87. He does not show respect for anyone in his family anymore.
88. He has never taken a chance with other dogs or other talking animals (yes, he made love to a dog once, forgot her name, it began with a "B"), but I mean another talking animal just like him.
Someone already mentioned he is pompous, an alcoholic, interested in bestiality, and a religious freak, but oh well.