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Mastiff puppies and dogs in Longmont, Colorado

Looking for a Mastiff puppy or dog in Longmont, Colorado? 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 Longmont, Colorado Other pups in Longmont, Colorado Search for a Mastiff puppy or dog near you Browse Mastiff puppies and dogs in nearby cities Browse related breeds in Longmont, Colorado Mastiff shelters and rescues in Longmont, Colorado Learn more about adopting a Mastiff puppy or dog

Adopt a Mastiff near you in Longmont, 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 Longmont, Colorado

These Mastiffs are available for adoption close to Longmont, Colorado.
We'll also keep you updated on Zeus's adoption status with email updates.
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Zeus

Mastiff

Male, 4 yrs 1 mo
Boulder, CO
Size
(when grown) X-Large 101 lbs (46 kg) or more
Details
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Story
Zeus is a big boy with lots of love to give, so if you`re looking for a 100 pound lap dog, look no further! Zeus is looking to be the center of attention in his next home and not share the spotlight with other animals, so we are requiring he go to a home without cats or other dogs. And while he`s done well with kids, his size makes it easy for him to accidentally knock over little ones! Because of that, HSBV will only rehome him to a family either without children or with children over the age of 10.

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

Mastiff

Male, 4 yrs 7 mos
Windsor, CO
Size
(when grown) X-Large 101 lbs (46 kg) or more
Details
Good with dogs, Spayed or Neutered,
Story
Bruno is guessed to be a 4.5 yr old Mastiff. This big guy craves attention from his humans! He is also great on leash. He needs a home where someone is home more often than not, due to displaying some separation anxiety. Someone who works from home, is an at home parent, or retired would be perfect! He is waiting in Aurora. Come meet him today.

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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, 3 yrs 11 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 Effie's adoption status with email updates.
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Effie

Mastiff

Female, Young
Denver, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Good with dogs, Good with cats, House-trained, Spayed or Neutered, Shots are up-to-date,
Story
Meet Effie, 1 year and 2 month old Mastiff mix who has a healthy appreciation for both naps and play time! She is a bit timid at first, but warms up very quickly. Effie is still young, so she is fairly quick to train and to learn new things. Effie is an amazing, kind dog - She is good with cats, dogs, and kids. After adopting Effie from the Humane Society, we discovered our senior cat was having an allergic reaction to her that worsened his pre-existing medical condition. For the sake of our cat’s health, we have made the difficult decision to find a new home for Effie. Effie thrives in a home with someone who can snuggle, play, and spend quality time with her.

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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 3 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 Maggie's adoption status with email updates.
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Maggie

Mastiff American Bulldog

Female, Adult
Golden, CO
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Spayed or Neutered,
Story
If you've been searching for a dog who will make you smile every single day, say hello to Maggie! This bright-eyed, tail-wagging sweetheart is the perfect mix of playful energy and loving companionship.Maggie is an active, joyful, and endlessly curious pup who's always ready for fun. Whether it's a game of fetch, playing with other dogs, or exploring a new trail, she's happiest when she's moving and sharing life's adventures with her favorite humans. Primary Color: White Secondary Color: Black Weight: 71.6 Age: 4yrs 2mths 3wks

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

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Mastiff puppies and dogs in nearby cities

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Related breeds in Longmont, Colorado

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

Mastiff shelters & rescues in Longmont, Colorado

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

Here are a few organizations closest to you:

Shelter

15.3 miles

Humane Society of Boulder Valley

2323 55th Street, Boulder, CO 80301

Pet Types: cats, dogs, small animals

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Rescue

22.4 miles

Big Bones Canine Rescue

Windsor, CO 80550

Pet Types: dogs

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Rescue

27.7 miles

All Aboard Animal Rescue

Fort Collins, CO 80526

Pet Types: cats, dogs

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Rescue

29.6 miles

Ace of Hearts Dog Rescue - CO Transport Stop

711 Walnut St, Boulder, CO 80203

Pet Types: dogs

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Shelter

33.9 miles

Foothills Animal Shelter

580 McIntyre St., Golden, CO 80401

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

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Rescue

37.8 miles

Big Dogs Huge Paws, Inc

PO Box 460699, Aurora, CO 80046

Pet Types: dogs

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Rescue

40.2 miles

L.O.L.A.'S Rescue

6005 S. Taft Way, Littleton, CO 80127

Pet Types: dogs

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Shelter

48.7 miles

Grand County Animal Shelter

3475 CR 57, Granby, CO 80446

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

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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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