Ozark Mountain Mastiffs

Tim S.

Breeder of Mastiffs

  • Ava, MO ·
  • Responds within a day

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, reach out to ask about the puppies or anything else on your mind. You’ll get to know each other through messaging, phone, or video and pay securely, all on Good Dog.

After buyers complete the application and screening process, Tim partners with them to find the best puppy match.

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.

All contracts are handled securely through Good Dog.

You’re protected
on Good Dog

When you pay and communicate on Good Dog, you’re covered by Payment Protection.

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 almost 4 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

Litter and program updates

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.

  • Ryan W.

    Verified owner · June 2026

    Tim was great to deal with ! He answered all our questions, was quick to reply and very helpful. When it came time to get out pup, he went beyond his way to accommodate us. We got to see the parents grandparents siblings and it was a great experience. I’d highly recommend getting puppies from Tim as he truly cares about the breed and is a great person!

    Jerred C.

    Verified owner · June 2026

    Form the very first message to the delivery or our girl Tim was very responsive and professional! The hand-off was seamless as wells and our Daisy Mae is fitting in great! I could not have imagined working with anyone better than Tim! Not to mention the price can’t be beaten for the quality and openness. All parents records were shared so we know what to expect. I would highly recommend working with Tim and we will definitely be going back if we are looking for another English Mastiff.

    John J.

    Verified owner · May 2026

      • +6

    It is tough finding the right breeder especially when purchasing a puppy online. It’s hard to trust people nowadays and that’s why we are so thankful that we found Tim. He responded quickly to our messages and answered any questions we had. Tim made the whole process easy and even sent us updates and pics of the puppy weekly. Tim delivered the puppy for us and made sure we had everything we needed. The puppy (now named Watson) is such a good boy and a beautiful pup and a great addition to our family. Thank you Tim and Ozark Mountain Mastiffs!

  • Wayne R.

    Verified owner · June 2026

    I found Tim on Good Dog after searching local areas via Facebook, and various Internet sites. I was highly suspicious with some of the sites I encountered. By using Good Dog I was able narrow down the type of breeders I was looking for and found OZARK MASTIFFS. Working with Tim we found our new family member. I could not be more satisfied.

    Kalob H.

    Verified owner · May 2026

    We got our puppy from Tim in May and the whole process was so easy. He sent us weekly updates and pictures. Any questions I had Tim responded usually within minutes. She was almost fully potty trained at 8 weeks when we got her and has no problem in her crate. When we met Tim to pick her up he had packet with all her information and took the time to explain everything to us. Her and our 1 year old English get along great and we will definitely be getting another pup from Tim in the future. Could not recommend Ozark Mountain enough. Thanks Tim!

    Finley T.

    Verified owner · May 2026

    I was a nervous wreck buying my first puppy, but Tim made it easy! He was knowledgeable, understanding, and very good at communicating. Boog has been with me for almost 4 weeks now. He's absolutely crazy and I love him. He's helping me heal from losing my childhood dog in January, and it's all thanks to Tim I've found my next companion :)

Photos

Related breeds

Boerboel

View puppies

American Staffordshire Terrier

View puppies

Staffordshire Bull Terrier

View puppies

Bullmastiff

View puppies

Cane Corso

View puppiesLearn about breed

Neapolitan Mastiff

View 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.

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.

your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites
your favorites