How often should he change the sheets?

Hi Marilyn Denis and Jamar,

My current boyfriend and I are doing the long distance relationship thing.  I work in the city and he works in Northern Ontario.  Every weekend we get together to spend time with each other.  So one weekend he’ll come down here and one weekend I’ll go up there.  Last time I was there we were hanging out in bed and noticed the bed smelled kind of funny.  I know he lets his dog sleep in the bed with him, but this time it felt like crumbs were in the bed and the pillows had a hint of cheesy chips.  I’m not sure how to ask him how often does he change his sheets?  How often should you change your sheets?

Thanks,

Becky