I am so sorry to hear about your babies, you must be a wreck. Dennis is only 4 1/2 months and it is a constant fear of mine even though the vet said he was fine. It is not so much his jumping, it is that he is clumsy and seems to be unsteady.
I never allowed any of my babies to jump off anything, especially the first 2 years. However after a couple of months they learned to call me when they wanted to go up or down. So Dennis will learn that I just don't allow it.
Sue |