daydreaming?

I wonder what's going on in that furry head, staring into space like that. Is he thinking about something, like running away from this boring home that has too many restrictions?

Go eat outside.
Don't stay in the kitchen.
Stop barking.

Or is he just bored out of his wits? Sometimes, he'll even let out a small sigh. That speak volumes and yet I don't know what it means...