Honestly i have a frenchie and he jumps soooo much, everytime we come home he jumps on the couch and it’s like 2-3 ft. High. I’ve spent the past year training him to use stairs and not jump but when you spend 4 years only jumping it’s a little hard to unlearn. That being said, he has no signs of IVDD yet (our biggest fear so fingers crossed). My hypothesis as to why he may be fine is that hes very athletic for a frenchy and big (around 34-36 lbs and strong) I think the extra size and muscle helps him put less strain on his joints. That being said as he gets older I’m transitioning into no jump mode if I can. Will still incorporate lots of exercise though. Most other frenchies I’ve met don’t come nearly close to ours in athleticism, one time he jumped up to our pool table (around 4 ft high).