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Mastiff puppies and dogs in O Fallon, Missouri

Looking for a Mastiff puppy or dog in O Fallon, Missouri? Adopt a Pet can help you find an adorable Mastiff near you.

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Adopt a Mastiff near you Mastiff in cities near O Fallon, Missouri Other pups in O Fallon, Missouri Search for a Mastiff puppy or dog near you Browse Mastiff puppies and dogs in nearby cities Browse related breeds in O Fallon, Missouri Mastiff shelters and rescues in O Fallon, Missouri Learn more about adopting a Mastiff puppy or dog

Adopt a Mastiff near you in O Fallon, Missouri

We don't see any Mastiffs available for adoption right now, but new adoptable pets are added every day. Try a different search below!

Or, how about these Mastiffs in cities near O Fallon, Missouri

These Mastiffs are available for adoption close to O Fallon, Missouri.
We'll also keep you updated on Bellatrix aka "Willow Eliza"'s adoption status with email updates.
Photo of Bellatrix aka "Willow Eliza"

Bellatrix aka "Willow Eliza"

Mastiff

Female, 7 yrs
St. Louis, MO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Spayed or Neutered,
Story
Bella is big and beautiful with a personality to match. This six-year-old mastiff mix girl adores people, snuggles, pets, and attention. She is spayed and up-to-date on all her medical care and is heartworm negative. Bella is a big girl, approximately 65 pounds, so while she is very good with people, she would be best with older kids who can keep up with her size. She is house-trained, and a fenced yard would be best since Bella is a large dog and likes to play. Bella likes her people so much she doesn't want to share and would do best as the only dog in her home. To meet Bella, visit istodaymydayrescue.org to fill out an application. Her adoption fee is $100.

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We'll also keep you updated on Finrir's adoption status with email updates.
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Photo of Finrir

Finrir

Mastiff Mixed Breed (Medium)

Male, 4 yrs 5 mos
St. Louis, MO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Spayed or Neutered,
Story
Meet Finrir (Finn)! Finrir, affectionately known as Finn, is ready to charm his way into your heart and home! About Finn: Finn is an 85 lb Mastiff mix with a heart as big as his size. He's a gentle giant who thrives on one-on-one attention and would love to be the center of your universe! Despite his size, Finn is a total softie. He's non-destructive and a pro at taking his medicine with ease. While Finn prefers to be the only fur baby in the house due to some dog reactivity, he'll fill your home with enough love to make up for it! What Finn Needs: A loving family who understands his need to be the only pet. Plenty of space for him to stretch out and relax. Someone who enjoys leisurely strolls because Finn walks like a true gentleman on the leash! Interested in Adopting? If you're ready to give Finn the forever home he deserves, reach out to Center for Animal Rescue and Enrichment of St. Louis - CARE STL Let's find this big guy his perfect match! Help spread the word by sharing this post with friends and family. Together, we can help Finn find his happily ever after! #AdoptDontShop #FosterDog

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We'll also keep you updated on Rutt's adoption status with email updates.
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Rutt

Mastiff

Male, 4 yrs 4 mos
St. Louis, MO
Size
(when grown) -
Details
-
Story
This 4 year old gentleman is new to us and we are still getting to know him. Information will be added once we learn more about him. Please consider fostering to help us learn more about our pups! For anyone looking for a lost pet or considering adoption or fostering, we encourage you to make regular visits to the shelter. Please note that this website is updated every 24 hours and may not include all the animals available at CARE STL. If you are interested in a specific dog, such as (name of dog), we invite you to stop by the CARE STL Adoption Center located at 2700 Walnut Pl, 63103. Simply ask for more details about the particular animal you are interested in.

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We'll also keep you updated on Rex Ramen's adoption status with email updates.
Photo of Rex Ramen

Rex Ramen

Mastiff

Male, 3 yrs 3 mos
St. Louis, MO
Size
(when grown) -
Details
-
Story
Big dog lovers, meet Rex Ramen. He's a gorgeous 3 year old big boy at 92 pounds. He is new to us and we are still learning about him. We will update his bio as we get to know him. Please consider fostering to help us learn more about our pups! For anyone looking for a lost pet or considering adoption or fostering, we encourage you to make regular visits to the shelter. Please note that this website is updated every 24 hours and may not include all the animals available at CARE STL. If you are interested in a specific dog, such as (name of dog), we invite you to stop by the CARE STL Adoption Center located at 2700 Walnut Pl, 63103. Simply ask for more details about the particular animal you are interested in.

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We'll also keep you updated on Jitterbug's adoption status with email updates.
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Jitterbug

Mastiff

Male, 1 yr 2 mos
St. Louis, MO
Size
(when grown) X-Large 101 lbs (46 kg) or more
Details
Spayed or Neutered,
Story
This poor 1 year old fellow was left chained up in someone's yard by his owner when they moved away. At 110 pounds, he is definitely part of the big boys club. We're still getting to know him and will update his bio as we learn more. Please consider fostering to help us learn more about our pups! For anyone looking for a lost pet or considering adoption or fostering, we encourage you to make regular visits to the shelter. Please note that this website is updated every 24 hours and may not include all the animals available at CARE STL. If you are interested in a specific dog, such as (name of dog), we invite you to stop by the CARE STL Adoption Center located at 2700 Walnut Pl, 63103. Simply ask for more details about the particular animal you are interested in.

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We'll also keep you updated on Papa Bear's adoption status with email updates.
Photo of Papa Bear

Papa Bear

Mastiff Mixed Breed (Large)

Male, 2 yrs 3 mos
St. Louis, MO
Size
(when grown) -
Details
-
Story
Large dog lovers, meet Papa Bear! He is around 2 years old and weighs 100 pounds. We are still getting to know him and will update his bio as we learn more. Please consider fostering to help us learn more about our pups! For anyone looking for a lost pet or considering adoption or fostering, we encourage you to make regular visits to the shelter. Please note that this website is updated every 24 hours and may not include all the animals available at CARE STL. If you are interested in a specific dog, such as (name of dog), we invite you to stop by the CARE STL Adoption Center located at 2700 Walnut Pl, 63103. Simply ask for more details about the particular animal you are interested in.

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These pups are in O Fallon, Missouri too!

Below are our newest added Mastiffs available for adoption in O Fallon, Missouri. To see more adoptable Mastiffs in O Fallon, Missouri, use the search tool below to enter specific criteria!
We'll also keep you updated on Marmaduke's adoption status with email updates.
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Photo of Marmaduke

Marmaduke

St. Bernard

Male, Adult
Lake Saint Louis, MO
Size
(when grown) X-Large 101 lbs (46 kg) or more
Details
Good with kids, Good with dogs, Good with cats, House-trained, Spayed or Neutered,
Story
Marmaduke is a sweet, loving, super chill St. Bernard, about 5 yrs old who came to us from a horrific hoarding situation. Marmaduke is a friendly and lazy dog who loves everyone he meets. He loves snuggling with his people and would be perfectly happy lounging around, getting belly rubs and being loved! He is a great sleeper and prefers to sleep on the floor next to his people. He has really missed having human connection so plan on him being by your side! He really thinks getting pets and hugs are the best! Marmaduke does require a fenced yard (no electric fences). He needs access to the outdoors where he can be contained in a safe environment where he won’t be able to wander off. He is not apartment appropriate as he weights 123 lbs and would certainly be over a weight limit! Marmaduke does love other dogs so a fur friend would be wonderful for him. He loves the company of other dogs so he’d love a friend to play with and snuggle. Marmaduke doesn’t know what toys belong to humans and what he’s allowed to play with. Toys are very new to him. Because of this, older kids who are not still playing with stuffed animals and toys would be fine for him. He’s a really sweet, loving, happy boy who has really acclimated well to being an inside, family dog! If you can provide Marmaduke the home with a fenced yard, lots of love and walks every now and then, please apply to meet him at www.luckychancerescue.com/adoption-aplication PLEASE NOTE: We do not do out of state adoptions. You must apply on our website if you'd like to meet Marmaduke. November 4, 2024, 1:05 pm

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Search for a Mastiff puppy or dog

Use the search tool below to browse adoptable Mastiff puppies and adults Mastiff in O Fallon, Missouri.

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Related breeds in O Fallon, Missouri

Bullmastiffs in O Fallon, Missouri Neapolitan Mastiffs in O Fallon, Missouri Saint Bernards in O Fallon, Missouri

Mastiff shelters & rescues in O Fallon, Missouri

There are animal shelters and rescues that focus specifically on finding great homes for Mastiff puppies in O Fallon, Missouri. Browse these Mastiff rescues and shelters below.

Here are a few organizations closest to you:

Rescue

21.4 miles

Is Today My Day Rescue

St. Louis, MO 63139

Pet Types: dogs

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Shelter

24.3 miles

CARE STL

2700 Walnut Place, St. Louis, MO 63103

Pet Types: cats, birds, dogs, farm animals, rabbits, small animals

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Rescue

25 miles

Nala and Friends Dog Rescue - ST. LOUIS transport

St. Louis, MO 63118

Pet Types: dogs

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Rescue

28.9 miles

Gateway Pet Guardians

725 N 15th St, East ST Louis, IL 62205

Pet Types: cats, dogs

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Shelter

32.3 miles

No Time to Spare Animal Rescue and Sanctuary

27933 Pendleton Lost Creek Rd, Warrenton, MO 63383

Pet Types: dogs, farm animals, horses

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Looking for a specific shelter or rescue?

If you're not seeing what you're looking for, try our shelter and rescue search. We have more than 17,000 organizations in our database with furry pals waiting for a new home!

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Want to learn more about adopting a Mastiff puppy or dog?

We've got all the info you need on adopting and caring for a Mastiff puppy. Check out the links below for everything you ever wanted to know about Mastiff puppies and adults.

Mastiff basics

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Where do Mastiffs come from? How many types of Mastiffs are there? From the history of the breed to question about average height, weight and size, brush up on these basic facts about the Mastiff.

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