The same thing has happend to me over the past 2 days my baby is 9 weeks old and when I got her the fist night she was a bit constipated but the breeder said it might be a bit of stress of a new home.I kept her on the same food as the breeder did so I new it wasnt that.anyway she came right and then I noticed that she was trying to eat her poop so when I rang my vet the vet nurse said she could be lacking something in her diet so Ive changed to a different food and shes a bit constipated again but when you change foods you have to do it very gradually like 75% old food 25% new food. well thats what I was told .hope this is abit of help
dianne