Kevin, there are people here on TSB who are very astute about squirrel nutrition and the composition of these products. I'm not one of them. All I can tell you is that both these products are made by Pet Ag, but they are NOT the same. Esbilac has a certain combination of probiotics and other nutrients that Pet Lac and the others do not have, and that means they are not good for wildlife. (They may be fine for puppies.)

Nearly every large pet supply store -- Petco, Petsmart, etc -- carries the right Esbilac in the can with the blue line around the top that says "with probiotics....blah blah". That's what you need.