Urgent Care Needed for Benji's Injuries

This is my dog Benji. He is about 13 years old. He was adopted after he had been found on the streets. He is a great dog and loves to travel. He also loves our cats and our foster kittens. He really helps us with the kittens so when they go up for adoption, they are ready for homes with dogs. He is very gentle with them and loves to play with them. We also have special needs cats, and he is really good with them, too. Unfortunately, this morning when he went outside for his normal bathroom time, he was attacked by 3 dogs that came out of nowhere. Ben is a small dog and is not a fighter. I am lucky that that he was able to scream loud enough that I could get there fast enough and he was able to fight them off. He has a bunch of bite marks, some deep and bled a lot. I don't drive so I am waiting for a ride to the vet, but I know this is going to be expensive, more than I have available on my limited income. I hate to sound like I am begging, but I love Ben so much and he is my first dog ever. I just want to get him the care he needs. Thank you in advance to anyone who can help me. If you can't, please forward this along. Thank you so much! (I am not going to show pictures of his wounds. I don't think that is good to show)

Bonnie & Ben