@Tequila I know what you mean by concerning. A pitbull is only really a dog by definition, because in reality it is almost a different species of creature all together.
A pitbull can be a great dog to have. They are highly intelligent, very loyal, and very fun to play with, they never get tired. Just, if there is one near you, that is not well trained, you really do have to do something about it.
My pitbull Clipper, is superbly trained. He has a voice command and hand gesture for everything, and never needs to be told anything twice. He will walk without pulling on his lead, he is trained to ignore other dogs and to just sit, even if he is being sniffed at or barked at, he can fetch, play dead, roll over, close doors, turn the lights on or off, and do loads of other tricks and carry out many different commands, but I still don’t trust him 100%.
Even my own dog, with how well he is trained, if he ever showed even the slightest aggression, I would have him put down immediately, they are just too dangerous if not handled right.
From what you are saying, this one sounds like it is just not treated right by the owners at all. If I want my pitbull to come inside, all I have to do is say “shhhht casa” and he will run inside next to his bowl of water. If they are having to pull it and shout at it, then it is not well trained, and all they are doing is confusing it and making it more dangerous by acting like that with them. In a sense they are egging it on to be aggressive.
You say the owner slapped the pitbull, that is wrong. A putbull can not be disciplined by hitting it, it is just too strong, if you hit it, the pitbull will think you are just playing. You would have to hit it so hard for it to get the message that it did wrong, that you would have to injure it, so hitting or slapping a pitbull is just pointless, they can’t be trained like that.
A pitbull is not like other dogs, it requires more or less the same dedication that raising a child does. They have so much energy, and get bored so easy, that it is really not a dog that you can just chain up when its convenient.
I live in Spain, a country that is not exactly famous for how well it treats animals. I have never organized or taken part in a dog fight, but I have been unfortunate enough to witness them, and I really cant emphasize enough just how dangerous this thing you have next door is.
The pitbull in the video I linked probably killed that man, and it was not even trying to. I can tell from looking at the video, that the pitbull in the video is just having a friendly game of tug of war with his owners arm.
If a pitbull attacks you, it will kill you, no ifs or buts, even if you live sandwiched between a police station and a hospital, it will get at your neck and take you out within seconds.
The reason I am putting so much effort in to this question, is because I know pitbulls very well, I have been around lots of them. This pitbull is not a little submissive weakling, it is a highly confident very capable dominant animal.
This pitbull has just been moved to a new area, with new smells. I can assure you, this dogs mission right now is to urinate on as many things as it can, and establish its dominance. It is not happy at all about that dog smell coming from your house, so close to its area of smell.
If you are not going to report it, be very careful with it, and at least talk with the owner. If the owner does not seem capable, or reasonable about talking to you, or is deluded about what a softy his dog is, then do absolutely report it.
If you had said doberman, retreiver, german shepherd, or any other breed, I would be telling you to just ignore it, and try to get along with these people, because you probably wont be able to get rid of them, and you own your house, they are only renting, and you have more to lose. But when you say pitbull, in a new location, and untrained, then it is really time to do something about it.