A dog raised in a single storey shelter block, a rural yard or a shipping crate may reach adulthood without ever going up a flight of stairs. What looks like fear is often simply an unfamiliar physical problem with no obvious solution from the dog's point of view.
Separate the two situations first
A newly adopted dog who has never used stairs and hesitates is learning. A dog of any age who used stairs last week and refuses today is a different matter, and the most common reason is discomfort. Blocking access and arranging an examination is the right order in that case, not encouragement.
Age is not the deciding factor here. Adoption paperwork rarely records an accurate age and plenty of adopted dogs arrive with undiagnosed joint disease.
Make the stairs readable
- Open risers are the hardest kind. A dog can see through them and cannot judge the surface. Blocking the gaps temporarily changes the problem entirely.
- Add traction. Stair treads or a runner give a dog something to commit to.
- Light the flight, including at night.
- Clear anything stored on the steps.
- Trim the fur between the pads, which does more for grip than most owners expect.
Teach the bottom two steps and stop
Work only the bottom two steps for the first several sessions. Up is easier than down for almost every dog, so start there and let him come back down at his own speed. Sessions of a minute or two, several times a day, beat one long attempt.
Let him move himself. Carrying a frightened dog up and setting him down at the top leaves him stranded somewhere he does not know how to leave, which is how a hesitation becomes a refusal.
What to avoid
Do not lure with food onto a surface he has not agreed to stand on, because a dog who follows food onto a slippery step and slips has learned the wrong lesson twice over. Do not push, drag or use lead pressure.
If nothing changes over a few weeks, or if he panics rather than hesitates, ask your veterinarian about both a physical examination and a referral to a qualified behavior professional. Persistent fear that is not improving is worth addressing properly rather than repeating.