I hate to tell you... but it may take a long time. Grim didn't like steps, either. He goes up them no problem. Coming down? Still an issue unless it's just a couple. Coming out of my van he still has a fit... and it's a full size van so low to the ground. He went up many steps at Bass Pro, but we took the elevator down because I knew he'd throw a fit and cause a scene. I carried him until he was over 40lbs. down a long flight of deck stairs at the old house. It was about a week before we moved that he FINALLY went down them. I have used treats, been slow and gentle, etc. He just doesn't like going down stairs that he's not used to. I don't know what the issue is with him, either. He doesn't even show hesitation to 99.9% of things. We have two small stairs to the yard here that he has no issue with. He'll get used to getting out of the van. Stairs, I think, are just going to take more time.
Wrath of Grim z Dragon
"Mr. Grim"- Threaten my handler. I dare you.