Is this bad?

So, I admit, we gave back our dog yesterday. That's not the worst part. We didn't say anything to Jack because we didn't want it to be hard for him while at school. BUT, he still hasn't either noticed or just not said anything about Maisy's absence. AND, we still haven't mentioned anything to him about her being gone. The sick and twisted part of me wants to wait to see how long it takes before he says anything, but what if it's days or even weeks, do we just say, oh ya, we got rid of her weeks ago? Crazy. I suppose if he doesn't mention anything for that long he probably won't, until he sees a picture or someone says something. Then I am hosed. Seriously and totally hosed.