On Sunday morning Max throw up, and I assumed it was because Sophie has eaten his food and he had been on an empty stomach.same thing yesterday but in the afternoon.I have been doing the switch from Royal Canine to Natural Instinct for the last month, so yesterday I gave him some RC again thinking it was too much protein for him...we truw up at 2.am, on my bed, poor baby. He is acting fine, active. The only new things are:
-his treats, not a new brand, just a new package (pupperoni)
-the food, which he still is getting mixed with RC, and ever since I introduced, a month ago, he is been fine, no loose stool, no vomiting

The only thing I can think of is parasites, but Sophie was dewormed, although she is a cat poop eater since our back has become the neighborhood litter box .
he just pooped and it was normal, he just walks to the kitchen but I don't want to give him anything.
Can anyone give opinions or had any similar experience?