River Valley Mastiffs

River Valley Mastiffs, run by Rebecca Davis, breeds AKC-registered mastiffs in Kennewick, Washington, in the heart of the Columbia Basin in the Pacific Northwest.

Health testing is central to the program. OFA evaluations are conducted on all breeding dogs to screen for hip and elbow dysplasia, and genetic testing covers conditions including CMR, PRA, DM, and Cystinuria. Families looking for mastiff puppies in Washington can expect puppies to arrive veterinarian-checked, microchipped, and with age-appropriate vaccines already completed.

River Valley Mastiffs keeps litter counts intentionally low, prioritizing temperament and structural soundness over volume. The program began showing dogs in 2018 and has since earned titles on several of its dogs. Puppies are raised inside the home using Puppy Culture protocols and early neurological stimulation, giving them a strong foundation for life in a family setting.

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