Why is my dog chewing the stair banister?

Stairs are often a transition area where a dog waits or lingers for a few seconds while a person goes up or down, and those short idle moments add up over a day into real chewing time on the nearest surface.

A stair gate at the base restricts access when you are not actively using the stairs together, and a chew toy kept in a basket at the bottom gives your dog something appropriate to grab during those waiting moments instead.

Gating only the top of the stairs is a common half measure, since a dog left loose downstairs can still reach the lower spindles and newel post while waiting for the family to come down. Gate both ends if the banister is being targeted rather than just the end nearest the bedrooms.

Check spindle spacing while you are at it: gaps wider than about nine centimeters let a small puppy push its head through and get stuck trying to back out, which is a separate safety issue from the chewing itself. A temporary mesh guard zip tied to the spindles solves both problems at once.

Refresh the toy basket at the bottom weekly rather than leaving the same two toys there indefinitely, since a stale toy stops competing with the banister's novelty. Rotating in something new, even an old toy your dog has not seen in a month, usually renews interest for another stretch.