that happened with my male when he was a puppy.....it ended up being a sensitivity to the food I was feeding him (Royal Canin Puppy food....my female was fine with it) These little guys have sensitive stomachs, he just couldn't tolerate something in the food....vet told me to switch foods, and it went away. Hopefully it will be something simple like change of diet for your little one! best of luck!!!
__________________ Piper  Leo  Baby Piccolo |