How are you dispensing the Tylan? It is Very Bitter, which may be why Sarge is refusing his meals. I put it in plain capsules and dispense with the vehicle of the day: peanut butter, liverwurst, cheese ... stuff like that.
Sarge
eta: Sorry, went back to see that you are using capsules. Please be very sure that there is no powder residue on them, b/c even a little bit will be nasty.