It sounds to me more like your dog trainer maybe has an issue herself with pit-type dogs. How can anyone pass the judgement that Buddha is a "bad dog" and "that's just the way he is" when he is so young?!? Puppies' personalities can change as they grow, just like everything else about them, and it seems like he is well behaved anyway!!

My advice: don't take the trainer's opinion to heart. And FIND A NEW TRAINER that is not so biased!!!