I didn't mean he should feed his gander probiotics like yogurt I just meant and sometimes I don't explain myself so well, that it's a good idea to give the probio when using a antibiotic because of digestive upset. But Kathy would be able to give info on when and what would be best. I really doubt he'd be able to get his gander to eat yogurt anyway my water fowl won't eat it I use powered probiotics in their water. Sorry if it sounded like I was rec yogurt .Not my intentionWhenever I've used antibiotics that are not water dispersible, I make it a point to use Probios dispersible powder in drinkers to prevent digestive irritation. The reason I avoid other forms of probiotic bacteria such as yogurt, those contained in milk products, or vitamin supplements is because those minerals have adverse effects to absorption of fluoroquinolones like Baytril. Of course, it is always a good idea to supplement vitamin-electrolyte-probiotic in waterers after the last day of antibiotic therapy.