I know what you mean by having irresponsible "friends". I have one like that. They got two husky-shepard mix puppies, threw them in the back yard and expected them to behave. One pup was mostly blind, and the other was mostly deaf. They grew up FAST... and soon figured out. They kept getting out of the chain linked fence. They family said they didn't want to get the dogs fixed... but after finally being fined from AC, they decided that maybe neutering might help "calm their hormones". Anyways, they then sectioned off a small portion of the yard and used some sort of really high chain linked fencing.
The dogs were ended up being HUGE. They family's 8 year old went out in the yard and tried to "play" with the dogs (unsupervised of course), and the deaf dog, knocked her down. The next day they took him to the pound, said he was aggressive, and had him put down.
A week later what do they do? They go on down to the pound and get another puppy. A black lab mix. A sweet thing. Except she acted like a puppy

. She was given no training at all, and would bite people (because of course she was a puppy and had nothing to chew on). I met this dog several times, and she was all puppy, not aggressive, all she needed was some good lessons manners. But she bit the daughter, and drew blood... and was returned the next day to the pound for being aggressive.
So now they have another puppy. He's sweet... a rottie-husky mix. Gunna be huge. I'm not sure of his fate... he hasn't (to my knowledge) bitten or be "aggressive" to anyone yet. But he is a puppy with no manners at all. And he's going to turn into a huge adult dog with no manners... so I don't like where this is going.
Sometimes, I wish you could report people for not teaching their dogs manners. Irresponsible people make me very sad.