My first thought was the spine issues too!

I have bichons, and Marlin slipped a disc jumping down off my Dad's bed 3 eyars back. Fortunately, some pain meds and 6 weeks of "bed rest" and he has been fine, but it could have been disastrous!

I bought a set of sturdy stairs for them to go up and down. They didn't take long to learn to use the stairs, and now even the cats use them (lazy or luxury? LOL!)

Anyway, I think they CAN learn that night bedtimes, they sleep in their bed. Nap times, including that morning 'nap,' they are allowed up.

I am more surprised that, having allowed them on the bed for a year (or more for the 4 year old), they have now accepted that they sleep on the floor! My usual statement is: Do something once and if they like it, it is a RULE!

So now you have 2 yea and one nay, plus 2 concerns re jumping. LOL Good luck!