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Mastiff puppies and dogs in Thornton, Colorado

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

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Adopt a Mastiff near you in Thornton, Colorado

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 Thornton, Colorado

These Mastiffs are available for adoption close to Thornton, Colorado.
Photo of Nala

Nala

Mastiff Husky

Female, Adult
Erie, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
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Story
We have had Nala since she was 8weeks old! She is now 5 will be 6 December 22nd! She is a cuddle bug for sure and loves to play! shes very smart and learns quickly. She is kennel trained, house trained and knows basic commands. She loves her paw held. She will literally be your best friend. She needs an active loving family. I have developed an allergy to her fur and while i have been able to manage it pretty well our work situation is also changing within the next few weeks and i dont want her home alone or kenneled for the majority of the day. She deserves better than that. She is up to date on shots and goes to her annual well checks. Shes also been to doggy boarding and does great. Shes great with other dogs big or small and loves kids. she loves anyone that loves her honestly. She is not spayed but probably should be.

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Tank

Mastiff Rottweiler

Male, Puppy
Denver, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Good with dogs, House-trained, Shots are up-to-date,
Story
DOB: August or September 2025 Intact because waiting until full grown Personality: He is a really goofy, loving dog. The kind that will melt into you. He likes kids and other dogs. He has been to doggy daycare and boarding without issues. Medium/high puppy energy. He’s food motivated and he does well with training exercises. Likes to hike, go for walks, and play at the dog park. Can play too aggressively for some small dogs. On the purina hydrolyzed diet since June 10. Has had chronic diarrhea on chicken, lamb, and salmon protein based foods. New diet stopped diarrhea. Yay! Dog friendly vegetables and fruit for treats. Reason for Rehoming: I travel 50% of the time for a new job. During my travel periods it’s been hard to train and provide the right activity level. My adult dog, a 5 year old lab, isn’t getting the attention he needs because of the pup as well.

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No photo available for Sabrina

Sabrina

Mastiff American Bulldog

Female, 7 yrs 9 mos
Boulder, CO
Size
(when grown) X-Large 101 lbs (46 kg) or more
Details
Needs special attention, Needs experienced adopter, House-trained, Spayed or Neutered, Shots are up-to-date,
Story
Meet Sabrina, a gentle 6-year-old Mastiff mix who’s in need of a special forever home. Sabrina is living with mast cell tumors (MCT) due to cancer and is currently on medication to keep her as comfortable as possible. She requires a loving home that is prepared to offer her hospice care and a peaceful environment. Sabrina can be shy with new people and may give a warning growl or snap if approached when she’s not ready. However, once she builds trust, she becomes deeply affectionate and very attached to her people. She gets along well with mellow dogs and will thrive in a calm household where she can feel safe and loved. If you have a compassionate heart and are ready to provide a supportive and caring home for a special dog like Sabrina, you’ll find a loyal and loving companion in her.

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Freya

Mastiff

Female, 4 yrs 1 mo
Aurora, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Good with dogs, Spayed or Neutered, Shots are up-to-date,
Story
Hi, I'm Freya! I'm a sweet mama and came with my 9 puppies. I'm a very good girl. I'm said to have had a few litters in the past and I'm ready to put motherhood behind me and have a little time for myself. Won't you spend it with me? If you're interested in adopting me, please fill out an application at www.polkcountyhumanesociety.org/adopt. You can also reserve an appointment to meet me. Some pets are in foster homes or may already have visits scheduled, so appointments help ensure I’ll be available. Polk County Humane Society is located in Bolivar, Missouri, and we welcome adopters from any state. We have access to a transport to Aurora, CO. Other out of state adopters either travel to Missouri or arrange & pay for air transport. Virtual meet and greets are available on the appointment request. ##2755149##

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Bayou

Mastiff Great Pyrenees

Male, 2 mos
Aurora, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Good with dogs, Good with cats, Spayed or Neutered, Shots are up-to-date,
Story
Meet this splashingly adorable puddle of puppies! Introducing Cove, Sea, Brook, Ocean, Reef, Harbor, Bayou, Lake & Creek! They are ready to send waves of love, fun, and playfulness right into your homes. Born to their mama Freya, these pups are going to make excellent dogs. They are a great mix of Great Pyrenees, Mastiff and who knows what- so they are sure to be big pups. NOTE: They will be available to meet at our PetSmart Adoption Events in Springfield and Rolla, MO on Saturday, June 27. Come meet them and take one home! If you're interested in adopting me, please fill out an application at www.polkcountyhumanesociety.org/adopt. You can also reserve an appointment to meet me. Some pets are in foster homes or may already have visits scheduled, so appointments help ensure I’ll be available. Polk County Humane Society is located in Bolivar, Missouri, and we welcome adopters from any state. We have access to a transport to Aurora, CO. Other out of state adopters either travel to Missouri or arrange & pay for air transport. Virtual meet and greets are available on the appointment request. ##2755259##

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Lake

Mastiff Great Pyrenees

Female, 2 mos
Aurora, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Good with dogs, Good with cats, Spayed or Neutered, Shots are up-to-date,
Story
Meet this splashingly adorable puddle of puppies! Introducing Cove, Sea, Brook, Ocean, Reef, Harbor, Bayou, Lake & Creek! They are ready to send waves of love, fun, and playfulness right into your homes. Born to their mama Freya, these pups are going to make excellent dogs. They are a great mix of Great Pyrenees, Mastiff and who knows what- so they are sure to be big pups. NOTE: They will be available to meet at our PetSmart Adoption Events in Springfield and Rolla, MO on Saturday, June 27. Come meet them and take one home! If you're interested in adopting me, please fill out an application at www.polkcountyhumanesociety.org/adopt. You can also reserve an appointment to meet me. Some pets are in foster homes or may already have visits scheduled, so appointments help ensure I’ll be available. Polk County Humane Society is located in Bolivar, Missouri, and we welcome adopters from any state. We have access to a transport to Aurora, CO. Other out of state adopters either travel to Missouri or arrange & pay for air transport. Virtual meet and greets are available on the appointment request. ##2755260##

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Use the search tool below to browse adoptable Mastiff puppies and adults Mastiff in Thornton, Colorado.

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Mastiff puppies and dogs in nearby cities

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Related breeds in Thornton, Colorado

Bullmastiffs in Thornton, Colorado Neapolitan Mastiffs in Thornton, Colorado Saint Bernards in Thornton, Colorado

Mastiff shelters & rescues in Thornton, Colorado

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

Here are a few organizations closest to you:

Rescue

16.2 miles

Ace of Hearts Dog Rescue - CO Transport Stop

711 Walnut St, Boulder, CO 80203

Pet Types: dogs

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Shelter

16.4 miles

Polk County Humane Society (in Missouri) - Colorado Transport

3511 N Salida Court, Aurora, CO 80011

Pet Types: cats, dogs

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Rescue

17.9 miles

Ho-Bo Care Boxer Rescue

Denver, CO 80209

Pet Types: dogs

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Shelter

18.7 miles

Denver Animal Shelter

1241 W. Bayaud Ave, Denver, CO 80223

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

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Rescue

23.7 miles

Big Dogs Huge Paws, Inc

PO Box 460699, Aurora, CO 80046

Pet Types: dogs

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Shelter

25.3 miles

Humane Society of the South Platte Valley

2129 W Chenango Ave, Littleton, CO 80120

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

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Rescue

28.1 miles

L.O.L.A.'S Rescue

6005 S. Taft Way, Littleton, CO 80127

Pet Types: dogs

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Rescue

32 miles

Homeward Bound Rescue of Colorado

Greeley, CO 80634

Pet Types: dogs

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Rescue

35.9 miles

Big Bones Canine Rescue

Windsor, CO 80550

Pet Types: dogs

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Rescue

41.8 miles

All Aboard Animal Rescue

Fort Collins, CO 80526

Pet Types: cats, dogs

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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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