hi, all pups have runny tummies when you introduce new feed stuffs. because you have small dogs they wont have to eat a whole lot. i have a 7 week old puppy at the moment and i have tried both wet and dry food with her. i found that vitalin and denes works fine for me. my pup loves the taste and i bought it cheap off ebay. the link below is the woman i bought it from, ive not yet left feedback, but you can message her for details and prices on this food.