Is your Dog a Picky Pooper?

This is my problem with Barbie, our youngest and only female dog who is turning 4 next month. She wouldn't release her poop even up to 3 days. The side effect is her lack of appetite in the morning and she frequently skips breakfast. What we have been doing for the past year is to use a suppository bullet that we insert in her rectum. That never fails to do the trick. In just seconds, Barbie would be running outside the house to move her bowels. I had already consulted our 2 vets on the matter but they have no other recommendation except the suppository.