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Mastiff puppies and dogs in Colorado

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

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Adopt a Mastiff in Colorado Search for a Mastiff puppy or dog Mastiff puppies and dogs in Colorado cities Mastiff shelters and rescues in Colorado Learn more about adopting a Mastiff puppy or dog

Adopt a Mastiff near you in Colorado

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

Mastiff/Boxer

Male, 1 yr
Mead, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Good with dogs, House-trained,
Story
We are so happy to introduce you to Sully! Sully is an 87 ish lbs, 1 year old, happy boy! We suspect he’s a Mastiff/Boxer mix. Sully is so friendly and boisterous. He loves to run and play with his canine companions. When it’s time to chill, he will calmly lay on a dog bed and chew his toys. Sully knows a few commands: sit, down, shake, drop it, and wait. He’s so polite (but sometimes he gets really happy and jumps up on you to say “hi”) and affectionate — please don’t stop petting him, that’s just rude. Sully is house trained, crate trained, walks well on a leash, and loves a good game of fetch. If you’re missing an over-sized, playful, teddy bear, he’s your boy! Sully is being fostered in Mead, Colorado. *We require all adopters to come to Colorado to adopt. *We do not transport dogs.* You can view this wonderful dog at https://www.milehighcanine.org/post/dogs/sully/. You can apply for our wonderful dogs at https://www.milehighcanine.org/adopt/adoption-application/.

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

Mastiff

Male, Adult
Denver, CO
Size
(when grown) Med. 26-60 lbs (12-27 kg)
Details
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Story
February 19, 2026, 5:43 pm

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

Mastiff

Female, Adult
Colorado Springs, CO
Size
(when grown) X-Large 101 lbs (46 kg) or more
Details
Good with kids, Good with dogs, House-trained,
Story
Rehoming the sweetest English Mastiff. We have had her since she was 8 weeks old, but will be traveling in the near future, unfortunately. Some "musts"- must have a back yard for her. She is not an outdoors dog, so an "average" size doggy door that she can come in and out of is also a must. Trained in all basic commands, potty trained, loves people, has never been aggressive towards people or other dogs, does not "food guard". Shes has been around children of all ages and is very gentle. She is a GREAT guard dog, will bark if something is amiss. She is lazy, making her an easy keeper. Must have love from family. In good health, has only ever had an ear infection. She is a gentle giant and will be very devoted to you. Rehoming fee of $50 to the right person. Note- you will want to have her groomed every 3 months or so. If you have a higher vehicle (SUV) you will need to be able to lift her back-side into it, must be able to lift 50 pounds of said back-side.

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

Mastiff

Female, Young
Denver, CO
Size
(when grown) -
Details
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Story
What a gorgeous sweetheart! Nani is so great! She's very sweet, gentle, friendly, fun and playful, and she has a calm, thoughtful personality. She's all about pets, cuddles, tummy rubs, and leisurely, luxurious walks with lots of sniffing on Nani-time! She just really enjoys being outdoors -- taking in all the sights, smells, and sounds, and stopping to smell the roses. Nani also loves treats and recently dried lamb and tripe was a hit. But most of all, she loves you and being your loving companion. Nani is housetrained and while she may be shy when meeting some men for the first time, she opens her heart when she knows you're a trusted friend. Only because of her size, kids age 10+ and no cats are best in a home with no shared walls. Nani is really an incredible, special girl, come fall in love!February 18, 2026, 6:24 pm

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We'll also keep you updated on Scrappy/Thor's adoption status with email updates.
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Scrappy/Thor

Mastiff

Male, Puppy
Grand Junction, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Good with dogs, Good with cats, House-trained,
Story
Scrappy and his brother Thor love each others and I think would do best together. They are from the same litter and have never been apart. I believe it would be best to keep them together. They are both potty trained and crate trained

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We'll also keep you updated on SCOOBY-DOO's adoption status with email updates.
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SCOOBY-DOO

Mastiff/Husky

Male, Young
Federal Heights, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Good with dogs, Not good with cats, House-trained,
Story
Hello my Name is Scooby-Doo I'm 2 Yrs Old I'm a Great and Very Loving Dog, However I'm a litte Hard Headed And Sometimes Times Stubborn. I'm Very Playfully, I Frequently Go to the Westminster Open Space Dog Park near Stanley Lake, I run and play with all the other Dogs making Friends and having a Wonderful time, Never Showing any Aggression towards the other Dogs or the other people there, I'm Well Tempted. My Eyes are Ghost Blue, I get that From My Husky Father and My Mother is Mastiff. I'm looking For Great new Home with tons of Love, And a Big Back yard to run And Play, All my Vaccination Are Current Threw The Spur Clinic, I Am Also Fixed and House Trained. PLEASE Consider Being My New Family and Home , Thank you

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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 Colorado.

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Mastiff puppies and dogs in Colorado cities

Mastiff Puppies near me Mastiff in Alamosa Mastiff in Arvada Mastiff in Aspen Mastiff in Aurora Mastiff in Avon Mastiff in Berthoud Mastiff in Boulder Mastiff in Brighton Mastiff in Broomfield Mastiff in Brush Mastiff in Canon City Mastiff in Carbondale Mastiff in Castle Rock Mastiff in Centennial Mastiff in Cherry Hills Village Mastiff in Colorado Springs Mastiff in Commerce City Mastiff in Cortez Mastiff in Craig Mastiff in Delta Mastiff in Denver Mastiff in Durango Mastiff in Eagle Mastiff in Edgewater Mastiff in Englewood Mastiff in Erie Mastiff in Estes Park Mastiff in Evans Mastiff in Federal Heights Mastiff in Firestone Mastiff in Fort Collins Mastiff in Fort Lupton Mastiff in Fort Morgan Mastiff in Fountain Mastiff in Frederick Mastiff in Fruita Mastiff in Glendale Mastiff in Glenwood Springs Mastiff in Golden Mastiff in Grand Junction Mastiff in Greeley Mastiff in Greenwood Village Mastiff in Gunnison Mastiff in Gypsum Mastiff in Johnstown Mastiff in Lafayette Mastiff in La Junta Mastiff in Lakewood Mastiff in Lamar Mastiff in Littleton Mastiff in Lochbuie Mastiff in Lone Tree Mastiff in Longmont Mastiff in Louisville Mastiff in Loveland Mastiff in Manitou Springs Mastiff in Milliken Mastiff in Montrose Mastiff in Northglenn Mastiff in Parker Mastiff in Pueblo Mastiff in Rifle Mastiff in Salida Mastiff in Sheridan Mastiff in Steamboat Springs Mastiff in Sterling Mastiff in Superior Mastiff in Thornton Mastiff in Trinidad Mastiff in Vail Mastiff in Wellington Mastiff in Westminster Mastiff in Wheat Ridge Mastiff in Windsor Mastiff in Woodland Park

Mastiff shelters & rescues in Colorado

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

Here are a few organizations

Rescue

Ace of Hearts Dog Rescue - CO Transport Stop

711 Walnut St, Boulder , CO 80203

Pet Types: dogs

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Shelter

Humane Colorado

2080 S Quebec St, Denver , CO 80231

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

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Rescue

Big Dogs Huge Paws, Inc

PO Box 460699, Aurora , CO 80046

Pet Types: dogs

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Rescue

Mile High Canine Rescue, Inc.

Mead , CO 80542

Pet Types: dogs

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Shelter

Grand County Animal Shelter

3475 CR 57, Granby , CO 80446

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

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Rescue

All Aboard Animal Rescue

Fort Collins , CO 80526

Pet Types: cats, dogs

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Shelter

Waiting Under the Willow Foundation - CO Transport

Colorado Springs , CO 80905

Pet Types: 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 information

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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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