I completed the switch to Merrick two weeks ago and harley loves it and has been doing fine until about 5 days ago. Since then she has had really loose stool once a day. She goes about 4 times a day and usually her last one of the night is loose but the others are fine. I feed her 3 times day and give her about half a tablespoon of pumpkin and yogurt at breakfast and lunch. is this something I should be concerned about? Any sugestions? Thanks.