Deer Creek Mastiffs

Deer Creek Mastiffs, run by Katie Holmes out of New Park, Pennsylvania, has been breeding English mastiffs since 1999, making it one of the longer-running mastiff programs in the southern York County area, roughly an hour south of Harrisburg.

Katie grew up with Boston terriers and later added English mastiffs to her family before building a breeding program around both breeds. The dogs live as household companions alongside the family, and puppies are raised in the home with daily handling and early socialization built into the routine from the start.

Health testing is a consistent part of the program. Parents carry OFA certification and undergo veterinary health screening, and the mastiff lines trace back to champion-pedigreed stock with attention to head, bone, and movement as outlined by AKC breed standards. Stud dogs are health tested as well. For families searching for English mastiff puppies in Pennsylvania, the program's dual focus on conformation and temperament reflects Katie's more than 27 years of professional experience working with animals. Boston terrier puppies round out the kennel's offerings alongside the mastiffs.

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