



I'm Theresa O., the breeder behind Heartland Cavaliers located in Otsego, MN. We breed and raise quality Cavalier King Charles Spaniels. They are loved and cuddled daily by my husband and I and our 5 children! We strive to raise puppies that are healthy and happy. We treasure each puppy and give them constant love and affection! Each of our dogs are a part of the family!
Why did you start breeding?
What makes your program special?
What are the different breed coat colors in your program?
Where do your breeding dogs live?
These dogs are already reserved or have gone home.
Boy 1
Male
Girl 1
Female
Boy 2
Male
Boy 3
Male
Boy 1
Male
Girl 1
Female
Girl 2
Female
Boy 3
Male
Girl 3
Female
Boy 2
Male
Girl 4
Female
Romeo
Male
River
Male
Juliet
Female
Bingo
Female
Theresa has been certified by Good Dog's screening team for responsible and trusted breeding practices. When you're ready to reach out, feel free to ask any questions about the breed, their program, or specific puppies.
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.

"Price includes guarantee, AKC limited registration, vet check, first round of shots and dewormer, microchip, and puppy socialization. I collect deposits 2 weeks after puppies are born."
Theresa 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 Theresa 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 Theresa directly.
You can drive or fly to pick up your puppy from Theresa.
Meet in Otsego, MN
Theresa has been a member of Good Dog for over 4 years
Theresa was screened for responsible practices and has been a member since 2021.
Theresa’s links

Heartland Cavaliers meets or exceeds our community standards in these areas:
Cavalier King Charles Spaniel
About Archer
Archer is a male Cavalier King Charles Spaniel. Carefully selected as a great representative of his breed, Theresa decided to make him part of their program. Theresa has passed Good Dog’s screening process, which involved a review of their breeding practices, environment, and the mental and physical health of their dogs.
Cavalier King Charles Spaniel
About Polly
Polly is a female Cavalier King Charles Spaniel. Carefully selected as a great representative of her breed, Theresa decided to make her part of their program. Theresa has passed Good Dog’s screening process, which involved a review of their breeding practices, environment, and the mental and physical health of their dogs.
Cavalier King Charles Spaniel
About Poppy
Poppy is a beautiful, gentle, easy going girl! We love her to pieces!
Cavalier King Charles Spaniel
About Fergus
Fergus is a male Cavalier King Charles Spaniel. Carefully selected as a great representative of his breed, Theresa decided to make him part of their program. Theresa has passed Good Dog’s screening process, which involved a review of their breeding practices, environment, and the mental and physical health of their dogs.
Great level
Heartland Cavaliers 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 Cavalier King Charles Spaniels.
Eye Certification (CAER, registered with OFA)
Eye testing reduces the chance of passing down a wide range of hereditary eye illnesses including retinal dysplasia, lens luxation, and glaucoma, which can cause impared vision or blindness.
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.
Patellar Luxation
Knee testing reduces the chance of passing down Patellar Luxation, which results in the kneecap becoming displaced or dislocated and can cause mild to severe joint pain.
DNA Disease Panel
Genetic testing reduces the chance of passing down a wide variety of hereditary diseases of differing prevalence and severity such as Progressive Retinal Atrophy (an eye disease) and Von Willebrand's Disease (a blood disease).