Yeah before I started her on the Angel Eyes I spoke to the vet I work for. He told me that the class of antibiotics that tylosin is in is not used very often in dogs. In fact he has never used it in any practice that he has worked for and that none of the practices ever carried it. You are right Brite Eyes it is a poultry antibiotic. Squeak has been on it for 3 months (which was an everyday dose) we are now at the next level which is 4 days a week for another 3 months, than we will go to the maintenance dose of twice a week (I will probably try to reduce it even more to see what the lowest dose is that I give her for maintenance.)