We have a 4 year old lab. When we leave the site sometimes we take him and sometimes we leave him in the tent trailer. This weekend our neighbour said he was whining a little, but said he wasn't bad....I don't know if she's just being nice. He barks when people walk by, if we are there or not, but when we are there we tell him to quite down, so I woner how long he barks when we are not. Probably until the people have past. If you want to leave him, go for a short time and ask the neighbour how he behaved while you were gone.