Are you feeding them the same food or different? Could he be getting into the new pup's food? If it's tummy trouble, he may not be able to wait.
If you're sure it's not that, then, yes I think it could be stress. I wouldn't let it go for long though. If it continues, I would see a vet on Monday.
__________________ The fullness of our heart is expressed in our eyes, in our touch, in what we write, in what we say, in the way we walk, the way we receive, the way we need. -Mother Teresa ( RIP Gizmo 3/9/07-8/18/12)  |