BS”D
I do want to mention again that Reb Shayale ZYA’s family cannot verify the story that led to his picture being used as a segula against mice.
However, a picture of a tzaddik in any room can serve as a powerful reminder to increase in our avoda. Reb Shayale ZYA certainly was a tzaddik and a tremendous baal chesed as well.
When it comes to mice though, call in a pro and make sure your home is properly sealed outside. If you’re in an area where feral cats have bred and live outside for generations it is a good idea to let them play in your yard as they chase the mice away before they get into the house. The perils of cat ownership, as well as their domesticity once allowed to live indoors, outweigh any benefits of bringing a cat into the house as a pet.