i thought i heard at this point that dogs are teething when theyre 10 weeks? well she sometimes chews on her toys and this rubber ring. and this portion of our old carpet that is kind of hard. i don't really mind since its an old carpet and its just the corner where no one can see. also when i am playing with her she opens her mouth and puts my finger inside but does not bite down on it at all. she just leaves it in there for a few seconds, takes it out, and licks it/my hand. she does this a few times. my friend tells me that its cause she misses her moms nipple and thinks my finger is it. is this true? what should i do?