animals don;t think that way.
Mine certainly did. He was so glad to be away from where he had been, and so happy we got him groomed...he would come up, give us a single lick and just lay by us so he was touching us. It was like " thank you!".
We rescued a cat. I have yet to see any sign of gratitude.
I often ask one of my rescue cats, "Do you think we crossed paths for a reason?" I hope I have enriched his life, because I know he has enriched mine.