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I'm Dannie R., the breeder behind Riot River Mastiffs located in Riddle, OR. This program is focused on longevity and workability in the modern Mastiff. I currently have a few crossbreeds, as it is still early in the program. I have so far produced stable and confident, relatively versatile dogs. Mainly hard hitting workers, a few therapy dogs and SDs as well. Q&A is welcome.

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?

Dannie 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.

"I understand that this is a broad range. I simply; and unfortunately, have to flow with the market. This is also based on overall cost at the time of raising said litter. I'm easy to work with! Deposit and price does not change depending on color, sex, or size. Deposit is added on to full price of pup. A deposit is simply required to weed out those who are not serious."
Dannie 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 Dannie 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 Dannie directly.
You can drive or fly to pick up your puppy from Dannie.
Meet in Riddle, OR
2378 miles away
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Meet at Portland Airport
2318 miles away
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Dannie has been a member of Good Dog for about 4 years
Dannie was screened for responsible practices and has been a member since 2022.
Dannie’s links

Riot River Mastiffs meets or exceeds our community standards in these areas:

All breeds
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Molosser (Bully x)

Perro de Presa Canario

Bullmastiff

Mastiff
Molosser (Bully x)
About Yoshi
Yoshi is a male Molosser (Bully x) almost 2 years old. Carefully selected as a great representative of his breed, Dannie decided to make him part of their program. Dannie 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.

Perro de Presa Canario
About Jumanji
Jumanji is out of Spartan Presa Canario Kennel (Sergio Vergara) and was unfortunately not treated the best by her first placement, who later ghosted her breeder Which is how I ended up with her! She absolutely lives up to her name. She is a little pocket rocket at just twenty four inches TtW, and eighty five pounds. She knows who she likes, and what she wants She is Presa to a tee. Endlessly affectionate, a little hard headed, and absolutely put all my patience to the test. A true guardian. Proven on small game, and on man.
Uploaded health tests

Bullmastiff
About Valkyrie Mae
V is a Bullmastiff x Mastiff outcross. Partnered with Project Guerrero Bullmastiff. A true gem of a dog. I value exceptional communicators skills, and V dog here has that in troves. Happy go lucky, always down to play, work, or cuddle, she is a dog who goes from zero to two hundred in an instant. She has an injury as a pup that caused her to have partial vision in one eye, but you'd never know. She is an all around stable, well rounded dog, who has taken any challenges she's been faced with, we completely devoured them. Proven on man and small game.
Uploaded health tests

Mastiff
About Trigger
Trigger is off my foundation female, Madelyne. He is majority Mastiff, with a small bit of Neapolitan. Defensively driven, and very owner oriented. He's very intelligent, and has a very goofy streak with his family. Medium prey drive, and biddable.
Excellent level
Riot River Mastiffs 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 Molosser (Bully x)s.
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 , 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.
Thyroid (Autoimmune Thyroiditis, registered with OFA), Spine (OFA, FCI), Temperament Test, Congenital Deafness (BAER, registered with OFA), Brucellosis
A breeder may perform additional tests on their dogs that do not fall into these general categories. These tests may be more uncommon or very specific to a particular breed.
Progressive Retinal Atrophy (PRA), Generalized, Hereditary Footpad Hyperkeratosis, Genetic Diversity Test, Dilated Cardiomyopathy 2 (DCM2), Dilated Cardiomyopathy 1 (DCM1), Full Embark Panel, Primary Hyperparathyroidism (PHPT), PRA Dominant (DPRA), Mastiff Type, PRA, Cone-Rod Dystrophy 2 (PRA-crd2), PRA, Cone-Rod Dystrophy 1 (PRA-crd1), DNA Profile, Cystinuria Type 3, English Mastiff Type Risk Factor, von Willebrand Disease III (vWD III), von Willebrand Disease I (vWD I), von Willebrand Disease II (vWD II), Degenerative Myelopathy (DM; SOD1A)
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).
Health testing is one key piece of responsible breeding and is performed on breeding dogs to prevent the presence of heritable conditions in their puppies.
Health testing is one key piece of responsible breeding and is performed on breeding dogs to prevent the presence of heritable conditions in their puppies.