I'm pretty into scientific stuff, but you raise a question I'm not sure can be answered...I'll try anyway. I think that animals have the same hormones that we do, in fact we are of the animalia kingdom as humans. We become attached to loved ones same as they do, pheromones and scents bond us together as families. I think that animals do in fact share bonds with each other, the imprint as you said, and the bond they share with close ones is stronger than with those of the rest of their species. Look at a cow moose or elephant that protects their young after they die, they stand over them and mourn, just as we do. Same for the young when their parent dies. Not all animals experience it the same though, squirrels regularly kill and eat their young. But cat and dog pets mourn the loss of their owners. Interesting question, but I dont think it can be as black and white as the options you presented, "yes I am aware of the imprint" or "I just feel close to you". The animal kingdom is very diverse, many critters share different experiences.