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Yes, I am a bit concerned.
A pet really should never have the appearance of a bloated belly, even if they ate alot, and certainly not if that meal was several hours ago.
The appearance of a bloated belly could be caused by:1. http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=672 (stomach bloat)2. http://www.petplace.com/dogs/ascites-in-dogs/page1.aspx (ascites, fluid in the belly)3. Worms4. Organomegaly (Enlargement of the Spleen, Liver)5. Tumor in the abdomen
So, I do feel this is well worth a vet visit, especially if the bloated appearance gets worse, or you begin to observe any other signs of concern like excessive panting, drooling, labored breathing, or trying to vomit.