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Mon/Wed: 8am to 6pm
Tues/Thurs: 8am to 7pm
Fri: 8am - 5pm
Saturday: 8am to 1pm
Sunday: Closed
1040 Fond du Lac Avenue
Kewaskum, WI 53040-9583
Phone: (262) 626-2380
FAX: (262) 626-8169

Meet Our Staff

Kewaskum Veterinary Clinic is a full-service veterinary medical facility, located in Kewaskum, WI. The professional and courteous staff at Kewaskum Veterinary Clinic seeks to provide the best possible medical care, surgical care and dental care for their highly-valued patients.

We are committed to promoting responsible pet ownership, preventative health care and health-related educational opportunities for our clients. Kewaskum Veterinary Clinic strives to offer excellence in veterinary care to Kewaskum, WI and surrounding areas.

Dr. Gregory Ogi, DVM

Dr. Ogi is a 1982 graduate of the University of Minnesota. Following graduation, he and his wife (Julie) moved back home to Kewaskum, where he joined his father in practice. Dr. Ogi bought the practice from his father (Dr. Charles Ogi, DVM) and is currently one of the owners of the Kewaskum Veterinary Clinic. Dr. Ogi and his wife Julie live just outside of Kewaskum on a small hobby farm. They have raised 7 children and now have 12 grandchildren. In his spare time, Dr. Ogi raises organically fed Black Angus cattle, chickens, and ducks. He also has 4 wonderful dogs (Georgie, Pokey, Buttons, and Maddie). On most days, Dr. Ogi can be found riding his Harley or driving his 1929 Model A Ford Coupe on his way into work.

Dr. Nicholas Wagner, DVM

Dr. Nicholas Wagner, DVM graduated from Iowa State College of Veterinary Medicine in 2004 and quickly found a passion for small and large animal medicine. After many successful years of practicing both, he made the decision to solely focus on companion animals with a special interest in orthopedic surgery. Dr. Wagner is one of the owners of the Kewaskum Veterinary Clinic and takes pride in knowing his clinic's sole purpose is to provide quality, progressive, and compassionate care to all patients entrusted to us. When Dr. Wagner has a moment of "free time" he happily spends it expanding his knowledge with the help of the Science Channel, hiking in the Kettle Moraine, or relaxing on his pontoon with is wife of seven years, Chelsea, Pepper Ray and soon to be expected little girl. The Wagner family continues at home with an assortment of animals including Bailey, a 15 year old Labrador mix, Gertie, a 7 year old Terrier Mix, Gretta a 8 month old yorkie and three perfectly behaved cats: Peanut, Geppetto, and Hildie.

Dr. Megan Theisen, DVM, CVA

Dr. Theisen is a double alumni of the University of Wisconsin - Madison earning her Bachelor of Science in Animal Science in 2015 and graduating as a Doctor of Veterinary Medicine in 2019. Following graduation she was thrilled to return to her hometown and join the team at Kewaskum Veterinary Clinic. Through various experiences while in school Dr. Theisen developed a keen interest in integrated medicine in order to provide another option for treatment and particularly pain control to her patients. Therefore, she became a Certified Veterinary Acupuncturist in 2019 after completing the Mixed Animal Acupuncture course at the Chi Institute ( and is currently in the process of becoming a Certified Veterinary Equine Medical Manipulation Practitioner via the Integrative Veterinary Medical Institute ( In her free time Dr. Theisen enjoys riding her horse in the Kettle Moraine, playing piano and spending time with family. She also has a 6 year old Russian blue mixed cat named Sumi who is happy to be the only cat in the household after having to live with her roommate's cat during veterinary medical school!


KEWASKUM, WI 53040-9583
Phone: (262) 626-2380

For emergencies please call Lakeshore Veterinary Specialists, which is located in Port Washington at 262-268-7800.