Our avery is about 3lbs and 4months.. she is definatley teething-we know that. but i was also curious what age they go into heat?? She too has been licking herself more often(but could just be what they do naturally to clean themselves??) also-we have a lil doggy toy that is her size and she too has been humping it!! i tell her to stop though-cuz it creeps me out!!
(i have heard that this is a dominance thing-and it doesnt always mean what we think it does-but i dont know)-haha.
I think our avery and your zoey are right about the same growth-wise etc. How much did she weigh when you got her?? do you know the weight of her parents?? zoey's a cutie. <3