I have a queen sized bed in my room with both the head of the bed and one side against the wall. I have three Yorkies ages 8 months, 1 yr 2 months, and 2 yrs 6 months AND my 40 lb English Cocker Spaniel all sleeping in my bed. I have them alll on the wall side and I get maybe 1/3 of the bed. My middle Yorkie, Max, is fragile (he only weighs 2 lp 9 oz) so I keep him up near the top of the bed. The only one that fell out of bed at night was the English Cocker Spaniel and she looked at me like I was the one who pushed her out of bed!