Hi, I have recently changed the puppies food from 10% raw/90%kibble to 10%canned/90%kibble. 2 of the are constipated the other 2 are fine. Any suggestions? They are still having milk from Mum and on 3 meals per day with water available all the time. They all seem happy and playing a lot. The reason for this is when the new owners take them in 2-3 weeks time I wanted them on a food easy for them to continue with, I thought the transition would have been fine.