The dogs feed off of your energy, and if DH is making you upset when he talks about Marley she will understand, esp if she always notices that you get upset and hears her name in the same sentence. I would politely ask him to stop teasing. If he loves you, and of course he does, then he will understand that it bothers you and he should stop. But then again, like I've said before, men are harder to train than dogs.