Sounds like they are right if you are just leaving a dog loose in the backyard 24/7 without teaching it anything.... He needs taught bite inhibition, house manners, crate training, leash training, basic OB commands, NILIF, and yes dogs are VERY expensive to feed and give basic preventative care to... nevermind the costs that could be incurred by a badly bred blue am bully pup. Food/environmental allergies are extremely likely, which means expensive food and vet care. You prepared for that? Can you afford training classes? Some people say just chain your dog in the backyard.... which is well and good if you live in the boonies where no one will harrass your dog. In town your dog will be suceptible to poisoning, harrassment, other animals jumping in and harrassing/hurting it, people shooting it (its happened to a member here...), etc. Oh and the huge risk of it getting stolen! Especially since its a "popular" blue bully pup. IMO its not worth it to ever leave a dog unsupervised in a yard in a populated area, fenced and/or chained even.