A feral cat I take care of was attacked, please help

I am very worried about a feral cat I take care of. I have been taking care of the generations of this cat "pride" since I moved to my house here five years ago. Sometimes they aren't so wild, and the cat I am writing about is sweet and lets me pet him. Yesterday I noticed that he has been attacked by some other, larger animal by his tail. It looks like where his tail meets the rest of his body is just raw and painful from the wound. Skin and hair has been ripped off in about an inch diameter all around the tail, and there are deep puncture fang marks as well. I got close enough to see it is in fact, infected. Its also been about 100 degrees outside and I am really worried for this guy.

Should I try to cut the fut away from the wound, and if I do, what next? I know I need to sanatize the wound, but I am afraid hydrogen peroxide would sting and hurt him really bad, this wound is pretty fierce. I can't afford to take him to the vet right now, but I want to do what I can to help him.

I just went through the same thing with a stray almost a month ago. Peroxide won't sting him. The cat I took in licked his wounds after I applied it. If you use oral bentonite or LL's detox clay in very small amounts on his wound, it can also help draw out the infection.

Give him a shaded sheltered area (even a unused dog house will work) with fresh water to beat the heat. If he's infected, he will have a fever that will kill him in 100+ degrees outdoors. If you have a litter box and can bring him indoors until he's recovered it would help him even more. Or just use this link to find a no-kill shelter.