What you do depends on how well you know them. Are they the sort to get easily offended? If not have a chat about leashing their dog, as even accidentally it could hurt or kill a little dog.
Even if their dog is friendly, big dogs can seriously hurt a small dog. If you have trouble with face to face discussion perhaps try putting a friendly worded note through their door. If they want their dog to run around in a large area, they should at the least use a long line, but it would be best to at least have the dog respond to recall first. We use a long line on Pip as when she gets a scent or sees another dog, she occasionally goes deaf. (though she's pretty obedient) If they care for the safety of their dog and others, they should at the least agree to the long line.
They sound like they need help with training advice, could you get together for drinks or something and discuss dogs. Do you know any decent trainers you could recommend. They may be asking for trouble using a e-collar, with a pitbull. If they build up resentment rather than a fair bond with their dog.
If they take offence easily or are the 'always know better' type, then report them anonymously.
Hope you resolve this issue. It's an accident waiting to happen. Any large dog that's out of control could be dangerous to the frail, young and old. It's not even about it being a pitbull.
__________________ Caleb   Pippi |