Help Bud Get Neutered

This is BUD!! I just saved him from the brink of death.. I got him from a lovely hobo who had 5 dogs and a cat in a cage in the backseat of his car, I unfortunately could only take one dog so the poor animals are still living that way. I would love some help to pay to get him neutered as everything else I’m gonna have to get him will be expensive.. as you can see he’s skin and bones and he also has no hair on his stomach I’m hoping I can help him with that.. if anyone has any tips on helping him gain weight in a healthy fashion that would be appreciated as well. Thanks all.. Godspeed :-)