OH the list is so long!
My Piper is just under 4 pounds. When she wants to get on the couch with my husband she stands by his feet and she "air barks" She barks without making a noise..Just her mouth moves. so my husband does it back to her. she goes nuts when he imitates her. So then she backs up and really barks. (outloud) She is so light that when she barks she comes off the ground..lol