Last week my friend vaccinated her two horses and the vet suggested administering the shots in the peck muscles since one or the other usually gets a little stiff from the shots. Well, she is now up to over $600 in vet bills due to a reaction I have never seen before. The horse blew up like a balloon, could hardly walk and just very ill. The vet came out and gave a steroid shot and said to try and keep him moving. Well Monday she took him in again because he was not getting better and had some fluid seeping from the pores. When she got to the vet they put a needle into his muscle thinking it was an abcess, well the nastiest smelling gas came out of his muscle everyone almost lost their breakfast. They had to cut him open and pulled out around a half gallon of dead rotting flesh and muscle. She had to take him back in again today for more clearing of the rotting flesh. HAS anyone ever heard of a horse reacting like this before? Is there any major concerns not already addressed she should be thinking about? Any advice will help both of us ease our minds.