So about three weeks ago, Matilda got a upper respiratory infection and the vet gave me baytril and doxy for it. The baytril was to be given to her for two weeks, and she finished that about a week ago(she's still on doxy until Tuesday). However, I noticed yesterday that her symptoms are returning. She's a bit sneezy again, and she did this hiccuping-squeak noise a few times(it looked like loud hiccups, she did it before, too). The baytril expires 02/29/12. I still have some left over- can I go back to giving that to her, and keep giving the doxy., too? Will I be risking anything that way?