I always keep a spray can in the house. The diffusers I find, don't work as well as the concentrated spray. Bad @$$ Buddy had a behavioral issue when he first came to my house. He had been in 7 homes in a year and was confused about where he belonged. One full spray in the bathroom and he never peed anywhere again, but the litterbox!!!

Catty1,

I never thought of squirting a little bit on the collar. Great idea!!!