Any time I have switched foods with my dogs I start out 3/4 old 1/4 new,1/2 and 1/2, then 3/4 new and 1/4 old. It takes 4 to 6 weeks,but if there is a problem I know it and it isnt hard to get them back on their old food. I have two poodles that have REALLY sensitive tummys. They cannt eat fish of any kind,not even just as an Omega 3 oil. |