I know for certain I could tell Smudge I'd just have to see his eyes and well he would have issues in a line up with a bunch of strangers around so he would be freaking out and such due to his seperation anxiety.

Winter I could most likely tell apart from others I would just have to look for the eyes that bug out of her head in constant wonder and her ever so cute perky yet at the same time floppy ears...that and just look for the dog that's being a complete and udder suck up to everyone else.

the fish no, not a chance on the fish...the two I like the best live outside all summer and go in to hiding and when they're inside I don't really have time to look at them.