I use about a teaspoon , here is a trick, after to take out a few teaspoons, go to the dollar store and get a ice cube tray. Freeze the remaining pumpkin in the cubes and when/if he ever has a upset tummy you can just thaw a cube or two. Its great to have it on hand. I put my icecube tray in a freezer bag in the freezer it prevents freezer burn.
Im sure he is fine , you said you took a long walk maybe he ate some grass or something along that way that you were unaware of.
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