Northern Illinois Cat Clinic - Over 25 Years Experience - Dedicated Quality Care For Your Cat The Northern Illinois Cat Clinic is Lake Countys first and foremost veterinary clinic dedicated to the health and well being of cats. Our Mission is to communicate compassion and respect to our clients in a home-like hospital setting by providing exceptional patient service based on the highest quality of care. Our staff has a deep, loving, and enduring dedication to the health and well being of each patient. Feline medicine and surgery has been our only mission since we were founded in 1982. The Northern Illinois Cat Clinic P.C. is the only veterinary facility in Lake County that limits its practice to cats. Our 2500 square foot facility is located in the Peterson Commons Shopping Center, one mile west of the intersection of Milwaukee Avenue and Route 137 (Buckley Road and/or Peterson Road) in Libertyville. Payment Plans Available!