Great advice here. I myself once had a 4 m/o pup that would fight adult dogs. If he got loose & there was a dog out he'd run over to them, bite their stifle, work his hold & have to be broken off! Luckily for him he still had his "puppy license" or he might have gotten hurt! A lot of people like to gloss over the history & reason for creation of the APBT, but the fact is, these dogs were created for dog on dog combat. It's in their DNA. And just like you would not rebuke a beagle puppy for zoning out to chase a rabbit or a setter for zoning out to set a bird, you can't rebuke an APBT puppy for going "red zone" (lmao @ that - you watch too much Cesar Milan!) on another dog. Here is a tip from someone who has been there & done that - you can NEVER train DA out of an APBT. So forget even trying. You can control it, with commands like "watch me" or "leave it," but that DA will be forever lurking under the surface ready to rear it's head the first chance the situation allows for it's expression. The fact is, these dogs are not for everyone & the home you have picked out doesn't sound right for this pup. He should be given a chance as all he is doing is being true to his breed. He is not "mean" nor is he "vicious," he's just DA, which is completely natural. Place him in a only dog, bully experienced home & don't gloss over the fact that he is highly dog reactive to his prospective adopters & all shoud be well. And as a side note, I think he looks OK. I have seen dogs with way shorter ears & his head looks fine. I think he's adorable! Good luck with him & let us know how things turn out! Blessings ...