



I'm Mark O., the breeder behind Mountain Guard Cane Corso located in Glendora, CA. We specialize in breeding high-quality Cane Corso pups. Our program is founded upon love and passion for this magnificent breed! We love these dogs for their trainability, guardian temperament, stability, devotion, and calm demeanor. It is important to us that our puppies go to loving forever homes that best fit each of their temperament and ability. We look forward to connecting with you!

Why did you start breeding?
What makes your program special?
Where do your breeding dogs live?

Mark has been certified by Good Dog’s screening team for responsible and trusted breeding practices. When you’re ready, reach out to ask about the puppies or anything else on your mind. You’ll get to know each other through messaging, phone, or video and pay securely, all on Good Dog.
Together, you’ll choose the puppy that’s right for you, stay in touch with regular updates, and plan how to bring your new puppy home.

Mark may provide a written contract or health guarantee when you purchase a puppy. This helps protect both you and your breeder, ensuring that you both have a clear understanding of the terms of your puppy purchase. If Mark offers a contract or guarantee, the details will be personalized by them. If you have any questions or want to know more, don't hesitate to reach out to Mark directly.
When you pay and communicate on Good Dog, you’re covered by Payment Protection.
You can drive or fly to pick up your puppy from Mark.
Meet in Glendora, CA
2246 miles away
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Club memberships
Mark is a member of Cane Corso Association of America.
Mark has been a member of Good Dog for about 5 years
Mark was screened for responsible practices and has been a member since 2021.
Mark’s links

Mountain Guard Cane Corso meets or exceeds our community standards in these areas:
Excellent level
Mountain Guard Cane Corso reports to performing the health tests below on their breeding dogs. Ask your breeder about the tests performed on the parents of your litter. Learn more about health testing for Cane Corso.
Hip Dysplasia
Hip testing reduces the chance of passing down hip dysplasia, which is primarily found in large breed dogs and can cause hip pain and the eventual loss of the function of the hip joint.
Elbow Dysplasia Finals (OFA, BVA, SV, FCI)
Elbow testing reduces the chance of passing down elbow dysplasia, which is primarily found in large breed dogs and can cause arthritis in the elbow joint and front leg lameness.
Cardiac Evaluation (registered with OFA)
Heart testing reduces the chance of passing down congenital heart disease, which can cause a range of symptoms ranging from trouble exercising to heart failure.