Ozark Mountain Mastiffs

Tim S.

Breeder of Mastiffs

  • Ava, MO
  • Responds within a day

Upcoming litters

Bruno
Betty

Expected Mastiff litter

Due Mar. 2026

Ready Apr. 26
Bruno
Louise

Expected Mastiff litter

Due Mar. 2026

Ready Apr. 26

Meet the breeder

I'm Tim S., the breeder behind Ozark Mountain Mastiffs located in Ava, MO. We are a small scale breeder who focuses on Mastiffs only. All our breeding dogs have some level of testing and we are Always honest, transparent and upfront about the testing that is done on every dog.

Q. & A. with Tim

  • Where do your breeding dogs live?

    They live in my home and a kennel on my property.

Matched dogs

These dogs are already reserved or have gone home.

Getting a puppy from Tim

Tim 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

Puppy prices include a $300 non-refundable deposit and between $700 - $1,200 final payment, before taxes & fees.

Contract & health guarantee

Tim 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 Tim 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 Tim directly.

Always communicate and pay on Good Dog.Learn more

What's included

    • From Good Dog
      • Lifetime support from Good Dog’s Care Team
      • 10% lifetime discount on Figo pet insurance
      • Puppy Training Program & private community
    • Enrichment & socialization
      • Various sounds
      • Car rides
      • Surface & tactile stimulation
      • Socialized with children
      • Socialized in new places
      • Daily handling
      • Socialized with other dogs
    • Puppy health practices
      • Vet check
      • First round of shots and deworming
      • Vet records
      • Microchip
    • Extras
      • AKC registration
      • Initial potty training
      • Food & treats
      • Basic obedience & manners
      • Registration

Location & pick-up

You can drive or fly to pick up your puppy from Tim.

Breeder's location

Meet in Ava, MO

838 miles away

·

Other pick-up locations

More about Tim

  • Tim has been a member of Good Dog for over 3 years

    Tim was screened for responsible practices and has been a member since 2022.

  • Tim’s links

Tim is a trusted Good Dog breeder

Ozark Mountain Mastiffs meets or exceeds our community standards in these areas:

  • Responsible breeding practices
  • Health of breeding dogs and puppies
  • Puppy environment and enrichment
  • Buyer education and policies

Parent dogs

Parent health testing

Breeder-Reported Testing

Excellent level

Ozark Mountain 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 Mastiffs.

  • 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.

  • 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.

Verified owner stories

Hear what other owners say about working with Tim to bring home their puppies.

  • Cami L.

    Verified owner · Mar. 2026

    I got my boy Theodore from Tim in October of 2025. He is almost 7 months old now and the most perfect boy. He is gentle, loving and a great cuddle buddy! Tim was great to work with and was very responsive to my many questions that I had. Tim even drove my boy all the way to me!

    Michael W.

    Verified owner · Feb. 2026

    After a significant amount of research into local breeders and breeders within a 6 hour drive from us (we're located in upstate Western NY), we found Ozark Mountain Mastiffs, located over 1000 miles and 5 states from us. More importantly, we found Tim. We were nervous about purchasing a puppy without being able to meet the breeder, the parents, or the litter in person. However we started reaching out to Tim about a year before we purchased our puppy from him. He was always willing to answer questions, provide updates on expected litters, and made testing records available on his Facebook page and through GoodDog. His honesty and transparency throughout the entire process is what put us at ease. Once we chose our puppy, Tim sent weekly updates proving pictures and videos, as well updates from the vet visits. Anytime we had a question or needed advice, Tim always answered in great detail and shared his expertise with us. We welcomed our puppy into the family on January 31st. He is an awesome "little" guy, with a great temperament, and has adjusted seamlessly to our family. We are so happy with him and our experience with Tim. We will definitely be repeat customers!

    LI

    Leslie I.

    Verified owner · Aug. 2025

    We were looking for a female English mastiff puppy to join our family and discovered precisely what we wanted at Tim’s Ozark Mountain Mastiffs. We had rejected breeder after breeder, just by looking at their breeding stock. First-class English mastiffs are strong, powerful, non-aggressive protectors for their families, but nowadays they are being bred too big, with massive chests, short legs and a linebacker’s body that’s guaranteed to bring pain and early death. Tim’s dogs have perfectly proportioned bodies --- sleek and sturdy, with long legs and solid, strong bodies. His mastiffs are welcomed as part of the family, which is as it must be because English mastiffs, like Tim’s, are protectors. Ozark Mountain dogs are shown with their people. Not only are Ozark Mountain dogs totally vetted, with complete paperwork guaranteeing their family heritage and their good health, but each is identified with its owner via being microchipped, so everyone knew which pup was ours. Tim came with his young son to bring our girl, during their state-to-state pup-delivery circuit. We drove up to meet him at our pre-arranged destination. They were right on time, gave us her paperwork along with a bag of puppy food, and confirmed our pup’s microchip ID via scanner. We paid via credit card, through “Good Dog” and then brought our happy, healthy new family member home. Mastiffs are a very old, very special kind of dog, bred to perform specific functions. These are physically powerful dogs that think for themselves, so their people must be strong-willed and able to train kindly. English mastiffs belong living with their families and must be handled firmly and gently because it is love for family that controls an English mastiff. Our 7-year-old male English mastiff, Shomer (in Jewish tradition, a “shomer” is a "guard" or "watchman"), and our 4-month-old Ozark Mountain girl are hitting it off perfectly, especially now that she’s gotten him wrapped around her paw. We named her “Ju-Ju”: In Louisiana, where we live, West African heritage in New Orleans, regards “juju” as “a magical or spiritual object, practice, or belief.” Yes, our Ju-Ju is a charmer, with her “fawn” coloration interspersed with black. In New Orleans she might be described as “a free pup of color.” She is most definitely a free-willed young lady, who is growing up strong and healthy, ready to take her place in our family. We are delighted! Ozark Mountain Mastiffs has earned our very highest recommendation. Photos show: Ju-Ju (at 2 1/2 months, when we brought her home) & Shomer

  • Kemberly O.

    Verified owner · Feb. 2026

    We purchased our male English Mastiff from Tim and the entire experience was professional from start to finish. Communication was clear, questions were answered thoroughly, and we felt informed at every step. Our puppy came home healthy, well-socialized, and with an excellent temperament. It’s obvious his puppies are raised with care and intention. Even after bringing him home, Tim remains available for guidance and support. We would confidently recommend Ozark Mountain Mastiffs to anyone looking for a well-bred, quality English Mastiff.

    BZ

    Betsy Z.

    Verified owner · Feb. 2026

    We couldn’t be happier with our experience with Tim! ❤️ We brought home our sweet mastiff Athena — who turned 10 weeks old today — and she is playful, energetic, and incredibly loving. From the very beginning, Tim was knowledgeable, responsive, and clearly cared about his dogs and where they were going. He even delivered Athena right to our home, which made the experience that much more special and convenient. Athena is healthy, well-socialized, and already such a wonderful part of our family. If you’re looking for a mastiff, we highly recommend Tim — we’re so grateful for our happy, beautiful pup! 🐾

    Shannon H.

    Verified owner · June 2025

    Tim’s extremely nice. He delivered our puppy to us happy and healthy! She’s been super easy to train! Could tell she was well socialized and taken care of!

Photos

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.

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.

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.

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.

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.

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