Sticky Kid Friend Situations

I am entering into some sticky kid-friend situations.

Problem #1: Patrick's friend, Seth, is a lovely boy. He's polite, and sweet, and generally pleased to do anything. He even loves our big dogs, and runs around the house playing tag with them and Patrick. Great, right? You wanna know why he's not afraid of dogs? Because his family has PIT BULLS. Why do I know this? Because he came over to me and told me that our dogs were good, but his isn't. I asked him what his dog did, thinking it ate his shoes or something, and he said, 'oh, when you point your finger at it, it bites your finger.' That's when I asked what it was, assuming it was a small dog, since they live in a VERY small townhouse, since he still has all his fingers, and that's when he said it's a pit bull - boxer mix. I am not against pit bulls, or boxers, in an appropriate environment. I think both can be lovely dogs, depending on the breeder and family situation. HOWEVER! Now that Seth has slept over at our house, reason determines that Patrick will probably be invited to go over there relatively soon. There's NO WAY I want him in that house (where, by the way, Seth has been allowed to watch all manner of slasher movies, because he was telling me all about Jason, Freddie and Michael Myers), but how do I approach this? I mean, WE have dogs, so I can't say that we're afraid of dogs. I'm not sure I can say, 'well, your boy told me that your dog bites him, and I love my baby's face, and want it to stay PUT'. What am I gonna do?!

Problem #2: The severely autistic boy down the street, Teddy, who pushed Patrick off of the playset, really likes Patrick. Patrick has been over there since the accident, to play with Teddy's older sister, with Josie. This morning, Teddy and his mother showed up on our doorstep because Teddy wanted to come over. Urm. There are several issues with this. One, I'm not sure I'm comfortable having Teddy here, with his obvious disconnect from cause-and-effect situations. Two, Patrick doesn't like Teddy all that much, for obvious reasons. Three, when I talked to Patrick about the situation, he said that he's OK with being with Teddy at his house, but he doesn't want him in our house because Teddy breaks things frequently by accident and he doesn't want his things getting broken (like our Wii, or, you know, Patrick's arm, which just stopped needing the air cast yesterday). Plus, he's unsure about animals, and it worries me what he'd do if he didn't want them near him (ie throwing things, kicking, screaming, etc, all things I've seen and heard him do from all the way down the block at our place). What do I do about this? I don't want to hurt Teddy's feelings, or his mother's. She's perfectly nice, and our kids do play there, so it's only fair that they could come here. But I will have to follow them around constantly, which to me is more like babysitting than a playdate, and Patrick is perfectly within his limits saying that he doesn't want his things to get broken. Also, I can't really say that his sister can come by anytime, but he can't. This morning, we were honestly on our way out the door, so it wasn't an issue, but I know this is going to come up again. I don't know what to do.

Issue #3: My friend Megan, who lives about a block away, has a large building that has been converted into apartments as a neighbor. One new tenant has a dog (yet another pit bull mix, what IS IT with these people!??!) that has been getting loose and busting through the shrubs onto their property, and getting loose in the alleyway that runs behind their houses, going into other yards as well. It's gotten so bad that her one daughter is afraid to play in her own yard. It hasn't acted aggressively towards the children (yet), but the one time Megan was sitting on her deck by herself and it came over, she didn't know what to do since it was blocking her only exit, and she just held out her hand and said, 'hi, good dog'; it growled at her and left. That doesn't exactly inspire a warm feeling. Our kids play there a lot. Megan's husband has reported the situation to the building's management company, and one of their other neighbors has gotten in the owner's face a little and told him that if it happens again, he's calling the police. Well, it's happened again, but the guy wasn't around. Megan's not a very forceful person, and doesn't want to call the police. I, however, AM, and I would more than happily call the police if I had ever seen it happen. As yet, I have not, but now I'm nervous. I've talked to my kids about staying away from strange animals, but having a strange dog of a breed like that bursting into the yard isn't, uh, optimum. What to do? Thankfully, I haven't seen it near our part of the neighborhood. I'm nervous to be anywhere near there with my dogs now, since a loose pit bull around boisterous labs is probably not a good situation. Suck.

Any suggestions?