This may seem an off the wall thought, but our dogs in the past have issues jumping for two reasons, they had hurt/traumatized themselves or they gained a good bit of weight recently. Mostly it's been the later, so it could be a recent weight gain or maybe they just ate alot and weighed a bit at the time.
__________________  R.I.P. Mick & Mandy (before 2010), Mila - 4/3/15, Chloe - 2/18/16, Kimchi - 6/2/2021 |