Lola is a normally mellow, gentle girl, especially considering she is only 1.5 years old.
We have had her at our home since she was 8 months old and got her from a family who had a grandson my son's age (currently a very mature 5.5 year old). She was the mellow one like her dad, with her mom and sister being much more "assertive" and driven. In all fairness, one weekend a month she still spends with them and comes home with some learned behavior I don't care for (I can tell when we're at the dog park and she's more dominant than usual).
I am careful not to let my son hang on her, etc...and he's good to her. Occasionally walking her on a short lead with pinch collar and she does well with him. He makes her sit while he feeds her breakfast and dinner. He takes her out of her crate when we get home, etc...But he doesn't have full command of her and that's probably not helping.
Anyway, I didn't realize this but he recently told me she bared her teeth at him quietly when he went to kiss her goodnight.
I knew she "knocked" him in the face/head a few times in the past when she didn't want him laying on her (not all his weight, don't worry!) or was getting too close to her face while petting her and I explained to him she can't communicate any other way to leave her alone, other than to walk away from him or "knock" him away.
But NOW he tells me a few times now she's bared her teeth a bit when she does it. This time I witnessed it myself and was mortified!
She was laying down and he went to say goodnight. He came in and said she didn't knock him but lifter her head and bared her teeth quietly in a warning sort of way. Since I told him to back away and yell no! at her if she were to do that again he did just that.
We went back in there and I laid down next to her and watched. He sat behind her head and went to kiss her on the head and without lifting her head her upper lip curled up a little. I scolded her and she knew I was not happy with her. I made her lay there while he kissed her and I warned her not to do it again. I praised her and pet her while she patiently let him kiss her head and scratch her cheeks.
Anyway, NOT OKAY!!!!
What do I do?! I need to nip this behavior in the bud! Does this have ANYTHING to do with her age at all?!