GorillaJTA
That guy.
You know how when people take lets say amoxicilin and we're suppose to take it for the 30 days we become immune to it. Well it works the same way with animals. If I stop giving Milo her meds before shes supposed to be off them, If she needs Baytril in the future for another problem that she could have then it won't work.
The reason that you are supposed to finish a course of antibiotics is not because you become immune to them. It is because if you do not finish the course, you risk leaving bacteria that become resistant to the antibiotic. There is nothing in an antibiotic to become "immune" to since it is not a virus or bacteria.