Wanting some ideas/opinions... My 6 yr old gelding had has a very swollen sheath for two weeks. Put him in a stall and noticed his rear legs were swollen. Had the vet out a week ago yesterday. He noticed a swollen mouth. He jumped to to Snap test and says Lyme's and Ehrlichia. Another vet says probably not since they get a lot of false positives. Long story short he's on some feed thru antibiotic from Farm & Fleet. Anyone dealt with this before? His sheath is huge and rock hard. He's eating, drinking, peeing, bucking and running. I'm concerned....