Four and half week old buck fawn develops fever between 102.2 to 102.7 F about every 3 to 4 days. He acts like his stomach hurts and hunches up. No diarrhea. We started with Baytril for 2 days he bounced back and did very well for 3 to 4 days. He is on red cap milk and doing well. After this time frame he developed fever again gave Baytril and within 4 hours he was once again fine. Our vet started him on Excenel for 5 days and was doing fine until the 4th morning and fever came back. Give the 4th shot of Excenel and within four hours doing well again. The vet will be taking a blood sample today. Any suggestions as to this fawn's problem.