Animal ER of Northwest Houston 27104 Hwy 290 West, Suite 107, Cypress Texas 77429 map >  |  281-304-0039
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WonderPet Rehab and Recovery Animal ER of Northwest Houston is a privately owned emergency and critical care veterinary hospital serving families in Cypress, Katy, and Waller as well as the local surrounding communities of Fairfield, Black Horse Ranch, and Bridgeland. Located directly on the access road of Highway 290 (Hempstead Rd) at Mueschke Rd, the Animal ER offers a convenient location that allows for seamless transport of your pet with minimal interruption or detours that may add additional stress to the situation. Animal ER wants owners to rest assured that no pet health problem is too small or too minor for an emergency room evaluation. Our experienced staff will collaborate to provide a concise care plan for your pet that addresses any of the concerns you face with your furry friend. Our hospital is devoted to providing the entire family and will dedicate the appropriate attention and time to explaining recommendations and planning, providing quality care to pets and giving owners peace of mind. 

Animal ER is staffed with professionals whose mission is not only to provide excellent medical services, but to create a customized critical care plan for each pet. We regard each patient as a prestigious member of your family as you trust us to care for them. We are committed to caring for hearts at both ends of the leash throughout minor and major injuries with care that exceeds the current standard of emergency veterinary medicine. Recognizing that handing over “leash” for a night of recovery is difficulty and our team will responsibly and honorably “hold that leash” with the utmost regard throughout your pet’s treatment. Our trained doctors and staff are dedicating to providing families with superior customer service as we strive to comfort families in their time of distress with their pets.  

Providing state of the art diagnostics, Animal ER of Northwest Houston is equipped to provide the necessary care for support and stabilization of injured dogs and cats. We are open nights, weekends and holidays to provide your pet with medical care during times that your veterinarian may be unavailable.  We recognize the obligations extend to providing care that helps both you and your family feel at home until your family veterinarian can resume care for your pet. Our caring staff remain on site and by your pet’s side from the point of admission for the duration of their care.

Animal ER will work with both you and your veterinarian to provide care that is intended for the purposes of diagnosis and support. Our goal is to provide flexibility within recommendations by discussing care options recognizing the reality of financial obstacles influence care decisions for many families.  We will care for your pet as one of our own under any situation, keeping those beloved pets’ needs as our first priority.


Teddy Bear Care Day

A community event hosted monthly for free kid-friendly fun and free stuffed animal checkups. Bring your favorite old or new stuffed animal for a FREE health check up by a real veterinarian. Learn and play veterinarian for a day!

Please visit the Animal ER of Northwest Houston Facebook page for more information.



Dr.Jennifer Hennessey Bremseth, CVJ 

Owner of the Animal ER of Northwest Houston, Dr Jennifer Hennessey-Bremseth has over 20 years of experience in emergency and critical care. Dr. Hennessey’s vision of an emergency practice designed and devoted to the customized care of both families and their pets lead her to develop the Animal ER in 2014.

A 2005 Cum Laude graduate of Texas A&M College of Veterinary Medicine, Dr Hennessey carries additional training as a Certified Veterinary Journalist with the American Society of Veterinary Journalists. Dr Hennessey is published in numerous magazines and journals, has a column in the Texas Veterinarian magazine, as well as is a frequent guest for Houston’s Fox 26, KPRC 2 News, Houston Life and Great Day Houston. Her professional interests include prevention of emergency illness, utilization of lipid emulsion for toxin exposure, and management of trauma patients.

Dr Hennessey serves on the TVMA Public Relations Committee as well as holds memberships with the Veterinary Emergency & Critical Care Society, the Harris County Veterinary Medical Association, the Texas Veterinary Medical Association, Veterinary News Network, the American Veterinary Medical Association, the American Association of Rehabilitation Veterinarians (AARV) , the International Association of Veterinary Rehabilitation and Physical Therapy (IAVRPT), the International Veterinarian Academy of Pain Management (IVAPM) and the International Sled Dog Veterinary Medical Association.

Off site, Dr Hennessey is actively involved with the Texas A&M College of Veterinary Medicine helping support their local emergency medicine society and works with vet students onsite at the ER through her externship and mentoring programs; she also serves on the TVMDL Advisory Council. Dr Hennessey, in 2014, enjoyed time as the Program Director at Pima Medical Institute and helped launch their new Veterinary Technician program. In 2015, Dr Hennessey was included as a veterinary advisor for a new project evaluating the nutritional care for dogs with cancer at the Keto Pet Sanctuary.

Outside of the ER, Dr Hennessey is a mother of two amazing kiddos and proud wife of Army Sergeant Major Greg Bremseth. Committed to her own health and well-being, Dr Hennessey is an International Bodybuilding Federation (IFBB) Professional athlete after winning the NPC Universe National Championship in 2018; she is also a dual pageant title holder as the current reigning Mrs Texas Legacy and Mrs Legacy Unites States, and co-owner of Crowned Regent Productions, LLC.

On a mission to stay connected and serve her local communities, Dr Hennessey has proudly partnered with the City of Houston and Harris County along with Precinct 5 as extension of care for seized animals, volunteering her expertise and services for the Harris County Animal Cruelty Task Force.


Roger L. Zinn, CVPM

Originally from Cypress, Texas, Roger Zinn has over 15 years of veterinary experiance in both general and emergency medicine. In 2014, he teamed up with Dr. Jennifer Hennessey Bemseth in her vision of opening and developing Animal ER.

Roger studied Animal Science at Sul Ross State University and Veterinary Technology at Cedar Valley College. He is also a graduate of Colorado State University's Veterinary Management Institute with a masters certificate in Veterinary Business Administration through the College of Veterinary Medicine & American Animal Hospital Association. Roger has been published in several national magazines discussing various topics within the veterinary industry. He has held many titles within the realm of veterinary medicine including being an adjunct educator for the Veterinary Paramedic Program at Houston Community College for 7 years and has lectured for various pharmaceutical companies on relevant veterinary topics all over Texas. Roger holds memberships with the American Animal Hospital Association (AAHA), where he sits on an Advisory Board, the International Association of Veterinary Rehabilitation and Physical Therapy (IAVRPT), Veterinary Hospital Managers Association (VHMA), and the International Veterinary Emergency & Critical Care Society. 

Roger enjoys music, art, and the theatre, but mostly spends his time away from the ER outdoors with his boxer named Warby.


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