I have been treating a hen for a respiratory infection. First I was crushing a little less than half a 800mg pill , mixing with oil and dropping it into her mouth. She was doing great so I stopped giving it to her. Now it has come back with a vengeance. I realized I can give her small pieces of the pill without crushing them so I did. But now I think I might be overdosing her. She has diarrhea. Does anyone have experience with bactrim and dosage for a chicken?