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Practice Name

Colorado Veterinary Specialists & Animal ER

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Primary Location
223 W. County Line Rd.
Littleton, CO 80129
Phone: 303-794-1188

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Colorado Veterinary Specialists offers a full range of services for dog and cat breeders and handles reproductive disease cases for pet owners. Printable forms can be found on our Reproduction Forms page.

As veterinary professionals, the welfare of all animals is our priority.  We will perform ovulation timing and inseminations for bitches we feel are healthy enough to sustain a pregnancy & whelping.  We expect our breeders to support us in our efforts.  To be considered for the breeding program at Colorado Veterinary Specialty Group (CVSG), all dogs/bitches must meet the following criteria: 

  1. All breeding animals must have had health testing as specified by their breed.  Please see the Canine Health Information Center (www.caninehealthinfo.org) or your specific breed club’s website if you’re unsure of the necessary requirements. Designer breeds should have the health testing required by the foundation breeds used to create the designer dog.
  2. Have a temperament that permits an examination, blood draw, semen collection or insemination without muzzle or sedation.  
  3. Must be in a healthy body condition, not over or under weight.
  4. Have no heart issues unless they present us with a cardiac evaluation by a Veterinary Cardiologist specifically stating the heart condition will not worsen with pregnancy.
  5. We reserve the right to refuse breeding services if we do not feel it would be in the best interest of the dog/bitch.   

  • New clients are strongly encouraged to schedule a consult with Dr. Hess prior to the bitch coming into season.  Availability for insemination will not be guaranteed for new clients without a prior consultation.

  • Ovulation timing (progesterone) can be performed on bitches not meeting the above criteria but these bitches will not be inseminated at CVSG.

  • As always, we will see any patient with a reproductive emergency or for a reproductive specialty consult regardless of their ability to meet the breeding program criteria.

Services offered for males:

  • Breeding soundness evaluation (this includes semen collection and semen evaluation for motility, concentration and morphology)
  • Semen collection for shipment (cooled-semen)
  • Semen freezing and on-site storage
  • Semen longevity testing (testing prior to shipping cooled semen)
  • Epididymal semen collection and freezing
  • Import and export of frozen and chilled canine semen
  • Prostate disease evaluation and treatment
  • Freezing of semen collected remotely and shipped to Colorado Veterinary Specialists
  • Brucella canis testing
  • Testicular and prostatic ultrasound

Services offered for females:

  • Breeding soundness evaluation
  • Breeding management (this includes ovulation timing, fresh semen insemination, cooled semen insemination, frozen semen insemination, and transcervical and surgical

  • Pregnancy diagnosis - an ultrasound is performed at 25 - 28 days following breeding. Ultrasound is a safe and very accurate way to diagnose pregnancy and evaluating the health of the pregnancy. Radiographs are also taken the week before the female is due to accurately determine fetal numbers
  • High-risk pregnancy management - evaluation and monitoring of females that have lost previous pregnancies
  • Scheduled and emergency C-sections
  • Medical management of uterine disorders such as pyometra and metritis
  • Elective, medical pregnancy termination

Heritable Disease Testing for Males and Females

  • OFA hips, elbow, patella and shoulder evaluation
  • PennHip evaluation
  • DNA test submission for breed specific disease screening

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Featured Services

Services We strive to provide complete care for our patients. Learn more about all the services we provide. Make An Appointment We will do our best to accommodate your busy schedule. Schedule an appointment today! Online Forms Our patient forms are available online so they can be completed in the convenience of your own home or office.


We loved dealing with Dr.Lewis and the staff. They were caring and patient with our dog's long diagnosis process & eventual amputation. The customer service was always good in a day and age where it is almost gone. They always followed through and allowed lots of time for questions at our appointments. We are so thankful to them and would recommend them in the future.

-Kirsten Phelan

Specialty Clinic Hours


Day Open Close
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
7:30am 7:30am 7:30am 7:30am 7:30am Closed Closed
6:00pm 6:00pm 6:00pm 6:00pm 6:00pm Closed Closed


  • 223 W. County Line Rd. Littleton, CO 80129
  • 303-794-1188
  • Get Directions

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