Favors for friend

So I have this one friend I really never hear from unless they need something. It wasn't always like this. Or maybe it was and I just didn't realize it. Anyway, a couple of nights ago he calls me and asks if I can go rescue a friend of his from the local ER where she is stuck with two small children. Mind you it's Midnight and I don't know this chic from Eve, but I agree to go and get them. When I get there it takes forever to get them in the van because she is on the phone. Then she informs me that she may have another ride on the way. So I wait. And end up taking her down the road to a gas station instead to the friends house that ask me to go get her. So I call him up and let him know I have her dropped off and he promises to come see me the next day. Well, he of course don't show up. I'm use to this from this person. But he calls me this morning needing another favor for this same girl. Initially I tell him I'll ask Hubby even though I know Hubby will say no. But when he calls for my answer he tells me, " Well she has someone to take them later tonight, can they stay at your house till then. It's just a few hours." So I ask Hubby if he minds. It is just for a few hours. Well, it ended up being FOUR dogs. When she came back a couple hours later to feed them, she let my little chihuahua  into the fence and one of her huge dogs got him. I'm sitting her now, steaming! Not only are the vicious dogs still here, but she hasn't even offered to pay to make sure my dogs OK. I know he needs a vet and I cant afford one. So come tomorrow morning I am going to call the pound to come get these vicious dog and let them know that they attacked my little one. And what happens from there I'm not sure. I may sue. Ive never been one to attempt to sue on stupid grounds but my dog means alot to the family.And she should have offered to take the dogs then and pay for mine to see a vet. I told them they couldn't stay over night. I'm angry that I allowed them to stay and I'm angry that they disrespected me such and I'm angry at my friend for asking me to begin with and now is ignoring my calls. I'm just so ANGRY!!!!!!  Suggestions on how to handle this anyone?