Antibiotics and your pet. I know there are times when it is necessary for our furry friends to take these synthetic drugs...so...when that happens, be sure to add a supplement to their diet to repopulate their gut with normal, beneficial bugs. In other words, give them probiotics! Kefir is great! I buy the organic plain variety...it's like a pourable yogurt....add some mushed (!!) up bananas or slice them up, pour the kefir over it...my furkids ♥ it!!