Cat attacked by dog

Hello,

I have been feeding an outdoor stray cat for some time now. He is about 20lbs. A neighborhood big dog attacked the cat 2 days ago. I heard the commotion and went outside and scared the big dog away.The cat was on his back and I was able to grab him before he ran away as he appeared to be really hurt. There was cat hair everywhere. He appeared to be in some kind of shock for the first 24 hours or so. He has 1 small puncture wound on front shoulder and many scrapes. The cat has been resting for about 48 hours now. I cleaned all wounds and the many tons of scrapes with peroxide, betadine and neosporin. I am giving him 50mg of Penicillin twice a day. He accepts very little food and water with assistance. His 3rd eyelids are not up and his eyes look clear. He is very tired and probably in pain from the swelling of his shoulder. I can't afford to take him to a vet. He has walked across the bed twice so I don't think anything is broken. He relieved himself on a bed pad made for hospital patients. What else can I do?  No vet will look at him without money and I don't have it. Humane Society or animal control will put him to sleep as he is a stray cat and scruffy. Doing the best I can with what I have. Am I giving him the right antibiotic? Can I gave him aspirin every few days. I just checked and he in now sleeping on the floor. Please advise me as to what else I can do. Thank you.

[Aleda M Cheng, D.V.M., C.V.A]

The dose for amoxicillin is 62.5 mg per cat twice per day.  Amoxicillin is a form of penicillin.   A 20 pound cat is really equivalent to two average sized cats so I think that you could safely increase the dose to 75mg twice daily.   50mg of penicillin twice daily is under dosing for any cat.   Please try and actually weigh him to be sure or his most recent weight since he may have lost weight since the incident.

He probably has not defecated as yet since he is not consuming much food.  Eating is very important, so please try and coax him with baby food meats if he won't eat cat food.

[Lakers66]

UPDATE: The cat does not appear to have anything broken. I just saw him jump off and on the bed. He however is not very mobile and just lays there all day. There is no more blood and the wound looks clean and small. I will attempt to wash it again tonight. I'm really concerned about the amount of Penicillin I am giving him and also need to know for how long. His urine is clear but I have not seen any stools. One more thing, he has what appears to be an abscess above a broken tooth. Looks like he may have already had this prior to being attacked.