"But anyways, how can you tell if an animal feels emotions?...."

Possibly, at least regarding herps, there is no evidence, behavioral or neurological, to suggest that they do.

I think the bigger question is why do some herpers so badly want it to be so? I cringe every time I see "he looks so happy" or "she loves that" to cite but two of the maudlin and inaccurate comments that appear.

Accept our wonderful, fascinating little creatures on their own terms for what they are. Don't insist on trying to make them something they are not.