Buster is hurt

He cut his leg a couple days ago, Ive been treating it but it got infection his leg is swelled up. So today I started Pennicillian shots its hard to do when he is already not feeling well then I have to mess with his leg then stick him with a needle. I dont think I will ever get use to doing that.
The picture is from November this May he will be a year old.http://i96.photobucket.com/albums/l1...12-2500015.jpg