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Mastiff puppies and dogs in Milliken, Colorado

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

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Adopt a Mastiff near you in Milliken, 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 Milliken, Colorado

These Mastiffs are available for adoption close to Milliken, Colorado.
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, Spayed or Neutered, Shots are up-to-date,
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 Ombre's adoption status with email updates.
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Ombre

Mastiff Boxer

Male, 4 yrs 2 mos
Fort Collins, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Spayed or Neutered,
Story
This pups adoption fee has been partially sponsored by All Aboard or an All Aboard partner! The new adoption fee is reflected on the profile. IMPORTANT NOTE REGARDING THIS DOG: Ombre can be easily startled by new people and things. He is occasionally slower to meeting new people, especially men, and other dogs. Ombre has the potential to get overwhelmed easily and can resource guard. Ombre needs an adopter who is patient and willing to continue his training. Ombre is big guy with a lot of love to give! He came to us with a few quirks that his foster has been helping him work through and he is constantly making progress! He does need an experienced adopter who will be dedicated to continued positive reinforcement training and ongoing socialization. He has come a long way since his arrival in January 2023 and needs the perfect partner in crime to help him continue making progress! Ombre can be a bit skittish with new sounds or unexpected movements and can resource guard at times. He is occasionally slow to warm up to new men and other dogs, but not consistently! He can get overwhelmed in new high-activity environments, so continued socialization is a must. Ombre is very loving and curious, and acts like he is his foster's shadow. This loving boy is a classic case of a dog who is worth the effort! With the right, experienced adopter who is committed to setting him up for success through continued training and socialization, Ombre will absolutely blossom into his adopter's most dedicated friend! He is house and kennel trained. Playgroup - https://youtube.com/shorts/Brmr_wwiRKs ADOPTION FEE: $75 We are a foster-based rescue and do not generally have pups available to meet at our office except during adoption events on Saturdays. Interested in this pup? The first step is to complete our online application by clicking the "Apply for Adoption" button. Please note that we are only able to finalize adoptions at events for approved adopters. The earlier you apply, the better as it takes time to review and approve applications. We host adoption events almost every Saturday from 11:00am to 2:00pm at Petco in Fort Collins (2211 S College Ave. STE 200, Fort Collins, CO 80525)! Check our Instagram and/or Facebook page for info on where we will be hosting adoptions this weekend! All Aboard Animal Rescue saves dogs and puppies from high-kill shelters in other states. These pups are brought to Colorado, where they are required to be spayed or neutered - breaking the cycle of unwanted litters of puppies who end up as strays! Please consider supporting us in this mission by adopting, fostering, volunteering, or donating.

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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, Spayed or Neutered, Shots are up-to-date,
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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We'll also keep you updated on Sabrina's adoption status with email updates.
Special Needs
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Sabrina

Mastiff American Bulldog

Female, 7 yrs 4 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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We'll also keep you updated on NANI's adoption status with email updates.
Photo of NANI

NANI

Mastiff

Female, Young
Denver, CO
Size
(when grown) -
Details
Spayed or Neutered,
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 HUDSON's adoption status with email updates.
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Photo of HUDSON

HUDSON

Mastiff

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

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Related breeds in Milliken, Colorado

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Mastiff shelters & rescues in Milliken, Colorado

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

Here are a few organizations closest to you:

Rescue

10.1 miles

Mile High Canine Rescue, Inc.

Mead, CO 80542

Pet Types: dogs

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Rescue

19.9 miles

All Aboard Animal Rescue

Fort Collins, CO 80526

Pet Types: cats, dogs

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Rescue

42.2 miles

Ace of Hearts Dog Rescue - CO Transport Stop

711 Walnut St, Boulder, CO 80203

Pet Types: dogs

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Shelter

45.6 miles

Humane Colorado

2080 S Quebec St, Denver, CO 80231

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

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Rescue

49 miles

Big Dogs Huge Paws, Inc

PO Box 460699, Aurora, CO 80046

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 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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