Mastiff Adoption in Belleville, IL: Mastiff Puppies for Sale in Belleville, IL

Adopt a Mastiff near you in Belleville, Illinois

These Mastiffs are available in Belleville, Illinois.

Red

Mastiff

Male, Adult

Swansea, IL

Size

(when grown) X-Large 101 lbs (46 kg) or more

Details

Good with dogs, House-trained, Spayed or Neutered, Shots are up-to-date,

Story

I received the dog in September 2025. I have papers on the dog showing birth, breed, neutered and current shot record. The dog is very timid, does not/will not sleep in a dog bed, and does not take getting shots well. Very good house dog and is house trained. Barks loud! I made my own schedule for taking the dog out daily to pee and poop. I take the dog outside 3 to 4 time daily. Dog does not run!

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Or, how about these Mastiffs in cities near Belleville, Illinois

These Mastiffs are available for adoption close to Belleville, Illinois.

Red

Mastiff

Male, Adult

Swansea, IL

Size

(when grown) X-Large 101 lbs (46 kg) or more

Details

Good with dogs, House-trained, Spayed or Neutered, Shots are up-to-date,

Story

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Big Dog

Mastiff

Male, 3 yrs 5 mos

East ST Louis, IL

Size

(when grown) X-Large 101 lbs (46 kg) or more

Details

Spayed or Neutered,

Story

This pet's adoption fee is sponsored by the Zach Schneider Memorial Fund, created in memory of Zach Schneider, who loved pets and fostered for Gateway Pet Guardians. Waived fees are sponsored by the Zach Schneider Memorial Fund, created in memory of Zach Schneider, who loved pets and fostered for Gateway Pet Guardians! Meet Big Dog — Big Sweetness, Big Fun, Big Love! Big Dog lives up to his name in every way—he’s large, he’s lovable, and he’s overflowing with joy. This gentle giant has a heart to match his size, and around here, we lovingly call him Big Sweetness because that’s exactly what he is. Despite his impressive stature, Big Dog is all softness on the inside. While we think he'd do best as the only dog in a home, he’s affectionate, friendly, and eager to make connections with every human he meets. Whether he’s leaning in for pets, flashing his goofy grin, or trotting around with those oversized paws, he brings an irresistible charm that wins people over instantly. And let’s talk about the fun—because Big Dog brings that in a big way, too. He’s playful, spirited, and always ready for an adventure. From giant-sized zoomies to joyful tail wags that practically create a breeze, he knows how to keep life lively and full of laughter. If you’re searching for a dog who will fill your home with love, laughter, and big-hearted companionship, Big Dog is ready to take up space in your house and your heart. Come meet him—he’s Big Everything you could want in a best friend. If you are interested in a meet and greet for adoption for Big Dog, please fill out an application on our website at www.gatewaypets.org/adopt. If you are interested in learning more about Big Dog or the adoption process at GPG, please email placement@gatewaypets.org All of our dogs and cats will be microchipped, spayed or neutered, and up-to-date on vaccinations at the time of adoption. For more photos of Big Dog, follow us on Facebook Gateway Pet Guardians and Instagram @gatewaypets ... #gpgBig Dog. To view other adoptable pets from our shelter, please visit, www.gatewaypets.org/adopt. Gateway Pet Guardians is proud to offer a variety of mixed breed dogs available for adoption. However, please keep in mind that we rarely know the genetic background of the animals we rescue and, as such, we cannot guarantee the exact breed combinations found within this dog. Therefore, we do not know his/her actual genetic makeup. Just know that this dog is probably a variety of several different breeds that have combined to create one very amazing and unique animal.

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Hippie

Mastiff

Female, 8 mos

East ST Louis, IL

Size

(when grown) Med. 26-60 lbs (12-27 kg)

Details

Story

This pet's adoption fee is sponsored by the Zach Schneider Memorial Fund, created in memory of Zach Schneider, who loved pets and fostered for Gateway Pet Guardians. Big Girl = Big Love! Hippie is all peace and love, baby! Every square inch of her screams "I love you, do you love me too?!" We just adore her friendly disposition and outgoing personality. If you're looking for a true bestie, Hippie is definitely the right fit for you. If you are interested in a meet and greet for adoption for Hippie, please fill out an application on our website at www.gatewaypets.org/adopt. If you are interested in learning more about Hippie or the adoption process at GPG, please email placement@gatewaypets.org All of our dogs and cats will be microchipped, spayed or neutered, and up-to-date on vaccinations at the time of adoption. For more photos of Hippie, follow us on Facebook Gateway Pet Guardians and Instagram @gatewaypets ... #gpgHippie. To view other adoptable pets from our shelter, please visit, www.gatewaypets.org/adopt. Gateway Pet Guardians is proud to offer a variety of mixed breed dogs available for adoption. However, please keep in mind that we rarely know the genetic background of the animals we rescue and, as such, we cannot guarantee the exact breed combinations found within this dog. Therefore, we do not know his/her actual genetic makeup. Just know that this dog is probably a variety of several different breeds that have combined to create one very amazing and unique animal.

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Jax

Mastiff

Male, 1 yr

Columbia, IL

Size

(when grown) Large 61-100 lbs (28-45 kg)

Details

Spayed or Neutered, Shots are up-to-date,

Story

Jax is one year old and weighs 74 pounds.The adoption fee for adult dogs, seven months and older, is $250. All pets are microchipped, up to date on vaccines, and will be altered prior to adoption. If you are interested in meeting a dog, please stop by the shelter during open hours. Dogs may be in a foster home, therefore scheduling an appointment is recommended. If you have an existing dog at home, we recommend bringing it along to meet your possible new family member.helpingstrays.org

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Gus

Mastiff Mixed Breed (Large)

Male, Adult

St. Louis, MO

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

Meet Gus! Gus is a charming 3-year-old mastiff mix with a heart as big as his paws. This gentle giant is friendly, outgoing, and absolutely loves people. He gets along wonderfully with other dogs and kids—just be prepared for a little “bull in a china shop” energy when he gets excited! Gus is house-trained, kennel-trained, and making great progress with his leash skills. He’s also an excellent car buddy, happy to settle in and enjoy the ride. If you’re looking for a lovable, goofy companion who brings joy wherever he goes, Gus might just be your perfect match! https://www.shelterluv.com/matchme/adopt/NAF/Dog

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Compton

Mastiff Labrador Retriever

Male, 2 yrs 11 mos

St. Louis, MO

Size

(when grown) -

Details

Good with dogs, Not good with cats, House-trained, Spayed or Neutered,

Story

Compton is a big-hearted, laid-back pup who’s been through a lot and is now searching for the perfect home to call his own. Found abandoned in a park back in January with a collar and lead still attached, it’s clear that he was once someone’s pet—but now he’s looking for a family that truly understands him. Shelter life has been stressful for him, making his search for a loving home even more urgent. While he’s an absolute sweetheart, he thrives best in a calm environment without young kids, as their energy and unpredictability seem to overwhelm him. Otherwise, Compton is truly the bestest boy! This gentle lug is fully crate-trained—though a little hesitant to go in at first, a toy will convince him, and once inside, he settles quietly. He’s also potty trained and will patiently sit by the door to let you know when it’s time to go out. A dream passenger in the car, Compton enjoys gazing out the window or relaxing for the ride. He walks beautifully on a loose leash and has done well with the few dogs he’s met, suggesting he could be a great canine companion with proper introductions. At his core, Compton is just a big teddy bear who deserves all the love in a peaceful, understanding home. If you’re looking for a loyal and affectionate best friend, Compton is ready to be your perfect companion.

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Mastiff puppies and dogs in Belleville, Illinois

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Mastiff puppies and dogs in Belleville, Illinois

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Adopt a Mastiff near you in Belleville, Illinois

These Mastiffs are available in Belleville, Illinois.

Or, how about these Mastiffs in cities near Belleville, Illinois

These Mastiffs are available for adoption close to Belleville, Illinois.

Search for a Mastiff puppy or dog

Mastiff puppies and dogs in nearby cities

Related breeds in Belleville, Illinois

Mastiff shelters & rescues in Belleville, Illinois

Looking for a specific shelter or rescue?

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

Mastiff basics

Mastiff basics