I experienced something similar with my two dogs. After the older one passed away, the younger one would sit outside, scanning the area with absolute determination, hoping to see him walking back home from around the bend or down the street. She eventually stopped after long enough. Makes me wonder what animals think happened to their buddies after they die.
I don't think they understand the concept of death unless they are there when the other dies. If you just take the dog and put it down, I don't think the other one can comprehend what happened.
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