Thanks guys. I'm definitely going to start putting him in the back of the truck. I'll look for a way of keeping him back there.
As far as the crate goes. I would use a crate to teach him where to go when I'm gone, right? After a while, after he learns, I could even take the crate away, right?
I also have another question. Everytime I'm walking Lou around the neighborhood and he sees another dog, he starts whimpering really loud and crying. I think he really wants to play, but should I let him? So far I haven't let him have contact with any other dogs, but that's more out of respect for the other person. I don't know how many people are comfortable with me allowing my dog to get close to theirs, you know?
So what do you recommend? Right now I just tell him to sit down and stay put, while holding his collar (he's also leashed to my wrist). Should I let him go play, or could he be crying because he's scared? (I don't think so because he gets really excited and wants to run at the other dog)
Thanks!