Hi Hector,
This is Paul from Angie's List. A carpenter or a handyman would probably be your best bet. Are you an Angie's List member? I believe you would be in our Salt Lake City chapter, where we have listings for many carpenters and handymen with an A or B rating. If you are a member, feel free to contact one of our neighborhood specialists at 888-944-LIST (5478) or go to www.angieslist.com to find a carpenter or handyman in your area who installs pet doors. We list the surrounding areas outside greater Salt Lake City that service providers cover as well, hopefully making it easier for you to find one who services Springville. Please let us know if we can help further.
Thanks,
Paul from Angie's List