I totally understand about pets being a distraction. However, if having a pet in my truck keeps me from needing to take 'home time' once every 8-9 days, it would be easier for them to just let me have her in the truck. Not to mention, make them and me more money. Now granted i understand how 'distructive' they can be, but my girl is well trained.....oh and so is my dog. ;-)
I would want some experience under my belt long before bringing a dog onto my truck. Need/want to understand the business before bringing something that might be a distraction. No different bringing a dog on the truck than your wife/girlfriend/hubby or b-friend.