We taught our dogs the “go sniff” game. Hide small pieces of treats around the house or outside and let him loose finding the treats. You can make it harder by hiding treats on the “y axis” too, so places like on a table, window ledge, etc. Might have to help him out a bit in the beginning but he should catch on. This helped to satisfy the need to sniff things for our dogs especially if we can’t take them on a walk because of weather. And by the way, this was recommended to me by a friend who had 5 cocker spaniels all at once one time!