When Finnian came to me as a foster 5 yrs. ago, he would KNOT jump into my SUV, and it got really old lifting him in (70+ pounds). It didn't take me too long to see that he could jump up on a high bed just fine when he wanted...especially if food was involved. So, started intensive training with him, first putting down a long carpet runner with rubber backing next to the car door so he wouldn't slip. Then, showed him pieces of steak and tossed them up into the back of my SUV. Let another gh jump up and get his treats, as well as show him how to do it. Within probably 3 days, he was leaping gracefully into my car, and we've never looked back. Good luck with your training approach, and best wishes for better health soon!