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Mastiff puppies and dogs in Ontario

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

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Adopt a Mastiff near you in Ontario

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

Clementine

Mastiff

Female, 4 yrs
Windsor, ON
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
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Story
Clementine is a gentle soul who’s still learning that the world can be a safe and kind place. This Mastiff mix came to us as a stray, so her past is a bit of a mystery—but it’s clear she’s feeling unsure and will need a patient, understanding adopter who’s willing to give her the time and space she needs to come out of her shell.At first, Clementine may seem shy and fearful, preferring to observe from a distance. But with a little patience and a lot of kindness, her true personality begins to shine. Once she feels comfortable, she transforms into a sweet, wiggly girl who enjoys affection and absolutely lights up for treats.Clementine appears to be curious about calm, respectful dogs and may do well with a compatible canine companion. Her history with cats is unknown. While we’re not sure how she feels about children, she may be okay with respectful kids who understand her need for space and can let her warm up at her own pace. Busy or loud environments—especially with young, energetic children—may be overwhelming for her.Clementine is looking for a quiet, loving home where she can build confidence and form strong bonds. If you have a gentle heart and the patience to help a shy dog blossom, Clementine just might be your perfect match.
We'll also keep you updated on Jaxon's adoption status with email updates.
Photo of Jaxon

Jaxon

Mastiff

Male, 2 yrs
Guelph, ON
Size
(when grown) Med. 26-60 lbs (12-27 kg)
Details
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Story
Hello! My name is Jaxon!I`m a friendly, loving guy looking for a home where I can go for adventurous walks and snuggle up with my humans. I`m a very good boy and super smart. You don`t even have to ask me to sit, that`s how good I am. MY IDEAL HOME INVOLVES…CHILDREN: Yes, with older/tall kids who are less concerned about being knocked over given my size and that I may jump when excited.OTHER DOGS: Potentially, with a friendly female dog. I don`t seem to love the boy doggos.CATS: Potentially, with a dog-savvy cat who has lived and done well with a dog before.FIRST-TIME DOG OWNERS: Potentially, if you have some large breed experience.FENCED-IN YARD: Recommended for a safe space to burn off some energy.HOUSING ENVIRONMENT: Any with plan for physical exercise/area to run.SOMEONE HOME MOST OF THE DAY: Not necessarily.SOME OTHER THINGS TO KNOW ABOUT ME…ACTIVITY LEVEL: Medium. HOUSE-TRAINED: Yes.If you think I could be a good match for your home, click the “Adopt Me” button to apply!
We'll also keep you updated on Noelle's adoption status with email updates.
Photo of Noelle

Noelle

Mastiff

Female, 4 yrs
London, ON
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Not good with dogs, Not good with cats, Needs experienced adopter, House-trained,
Story
Re-introducing Noelle! Noelle Fostered in London, On Vaccinated & Spayed & Microchipped Adoption Fee: $500 Mastiff Mix (our best guess) Hi, I’m Noelle! I’m about 4 years old, and I’m a Mastiff mix who started life as a stray—but thankfully, I was rescued. I’ve been waiting over a year for my perfect forever home, and I think it’s finally my time to tell the world about myself since I've been introduced last. I love going for walks and car rides, but most of all, I adore my people. I’m happiest right by your side (or on your lap, if you’ll let me!). I’m gentle, affectionate, and wonderful with kids I’ve had more stress in my life than a girl like me deserves, so sometimes I can be a bit reactive. The good news is I’ve made amazing progress with my foster family and my friends at Holy Sit Training. I usually walk really well—especially if you bring treats (hint hint!) I am officially Heartworm negative!! which now allows me to get my zoomies out and make you laugh Every now and then, things like certain dogs, motorcycles, or other wheeled vehicles can make me anxious. When that happens, I might jump around or try to chase, so I’ll need someone strong and confident to help guide me—I’m about 80 lbs, after all! I’m very food-motivated and eager to please, which makes training fun and rewarding. I do have a high prey drive (skunks beware) , and while I’m curious about the resident cat in my foster home, she’s not too interested in being my friend… although we’ve been caught almost snuggling once. I’d love a home with a fenced yard (at least 4 feet—I can leap like a ballerina!). Most importantly, I’m looking for someone patient and experienced who can continue helping me grow with structure and training. In return, you’ll get the most loving, loyal cuddle bug you’ve ever met. I just know my perfect person is out there—could it be you? -Noelle BSDRO Foster Dog XOXO
We'll also keep you updated on London's adoption status with email updates.
Photo of London

London

Mastiff/Boxer

Female, 3 yrs 2 mos
Guelph, ON
Size
(when grown) Med. 26-60 lbs (12-27 kg)
Details
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Story
Hello! My name is London!I`m a fun and loving girl! I am snuggly and affectionate. I love treats and toys, which makes training a blast! I sometimes get excited and like to grab sleeves with my mouth. I thought that was fun but apparently humans don`t enjoy it as much as I do. No worries though, I`m super smart and doing well with training - I`m learning about other fun things to do instead. If you love cuddling, playing and snoring, I am definitely the girl for you!MY IDEAL HOME INVOLVES…CHILDREN: Teenagers may be ok. No young kids given my mouthing can sometimes be hard.OTHER DOGS: I don`t seem to enjoy the company of other dogs and I`m looking to be the only dog.CATS: Potentially, with cat experienced and confident around dogs.FIRST-TIME DOG OWNERS: I would do best with someone who has dog experience.FENCED-IN YARD: Required.HOUSING ENVIRONMENT: Any with yard.SOMEONE HOME MOST OF THE DAY: Not necessarily.SOME OTHER THINGS TO KNOW ABOUT ME…ACTIVITY LEVEL: Medium.HOUSE-TRAINED: Yes.If you think I could be a good match for your home, click the “Adopt Me” button to apply!FOSTER ME! I’m excited to be selected as part of the Paisley Project and I’m looking for a foster home! If your home environment matches what I’m looking for based on the information above, please consider applying to foster me by copying and pasting the following link to fill out the questionnaire: https://guelphhumane.ca/wp-admin/admin-ajax.php?action=frm_forms_preview&form=7y88o.The Paisley Project aims to match selected, long-stay animals at GHS with fosters that can provide a home that gradually introduces them to the everyday experiences of life as a pet. Fosters will offer the routine, structure and stability needed to help get animals ready for their new family. Learn more at https://guelphhumane.ca/the-paisley-project/.
We'll also keep you updated on Priscilla's adoption status with email updates.
Photo of Priscilla

Priscilla

Mastiff

Female, 6 yrs 2 mos
Toronto, ON
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
House-trained,
Story
Meet Priscilla, queen of the dog park! Priscilla is such a cutie and just the sweetest girl. She has a curious spirit, a love for treats and has already shown herself to be an affectionate and eager-to-please dog! She always gets excited to see our volunteers and will greet them with her whole body wagging, eager for some attention and maybe a tasty snack or two. On walks, Priscilla is excited to explore and does well when walked at her pace. While she’s confident enough to explore quieter areas, she can get a little spooked by busy or high-traffic zones, but she settles down quickly once she’s in a calmer environment. She’s a quick learner, and she comes right to you when called, especially if there’s a treat involved. Priscilla really enjoys spending time outside, whether walking, playing or simply people-watching. She just enjoys being in the moment! When it’s time to head back, she’s easy to return back home and will happily go back inside for a good petting session. Priscilla is a friendly and sweet-natured dog who thrives on companionship. She will need a patient family that can continue to build her confidence and help her adjust to her new routine at her own pace. She will soon blossom into the loving, loyal companion she’s meant to be. Come say hi to Priscilla today!
We'll also keep you updated on HK's adoption status with email updates.
Photo of HK

HK

Mastiff

Male, 5 yrs 10 mos
Toronto, ON
Size
(when grown) X-Large 101 lbs (46 kg) or more
Details
House-trained,
Story
HK is a big, goofy 100-pound sweetheart who truly believes he’s a lap dog! This gentle giant has a heart as big as his paws and is always ready to make you smile with his silly antics and affectionate personality. HK loves spending time with his people — he’ll lean right in for cuddles and happily soak up all the love you have to offer. HK’s favorite things? Treats, exploring new places, and being your #1 sidekick. He enjoys going for walks and exploring the world, though due to his size and strength, he’ll need someone comfortable handling a large dog. HK is currently working on his leash manners and learning to stay calm when he spots other dogs. With ongoing positive reinforcement training, he’s making great progress and showing that he’s eager to learn! If you’re looking for a loyal, loving best friend who’ll fill your life with laughter (and maybe take up a bit of space on the couch), HK is your guy!

Search for a Mastiff puppy or dog

Use the search tool below to browse adoptable Mastiff puppies and adults Mastiff in Ontario.

Mastiff puppies and dogs in Ontario cities

Mastiff Puppies near me Mastiff in Acton Mastiff in Alliston Mastiff in Almonte Mastiff in Amherstburg Mastiff in Angus Mastiff in Arnprior Mastiff in Aylmer Mastiff in Ayr Mastiff in Azilda Mastiff in Barrie Mastiff in Beamsville Mastiff in Beeton Mastiff in Belleville Mastiff in Binbrook Mastiff in Blenheim Mastiff in Bobcaygeon Mastiff in Bolton Mastiff in Bowmanville Mastiff in Bracebridge Mastiff in Bradford Mastiff in Brantford Mastiff in Brighton Mastiff in Brockville Mastiff in Caledon East Mastiff in Caledonia Mastiff in Campbellford Mastiff in Carleton Place Mastiff in Casselman Mastiff in Chatham Mastiff in Chelmsford Mastiff in Clinton Mastiff in Cobourg Mastiff in Cochrane Mastiff in Collingwood Mastiff in Cornwall Mastiff in Corunna Mastiff in Crystal Beach Mastiff in Deep River Mastiff in Delhi Mastiff in Dorchester Mastiff in Dryden Mastiff in Dunnville Mastiff in Elliot Lake Mastiff in Elmira Mastiff in Embrun Mastiff in Espanola Mastiff in Essex Mastiff in Exeter Mastiff in Fergus Mastiff in Fort Erie Mastiff in Fort Frances Mastiff in Gananoque Mastiff in Georgetown Mastiff in Goderich Mastiff in Gravenhurst Mastiff in Guelph Mastiff in Haileybury Mastiff in Hamilton Mastiff in Hanover Mastiff in Hawkesbury Mastiff in Hearst Mastiff in Huntsville Mastiff in Ingersoll Mastiff in Innisfil Mastiff in Iroquois Falls Mastiff in Kanata Mastiff in Kapuskasing Mastiff in Kemptville Mastiff in Kenora Mastiff in Keswick Mastiff in Kincardine Mastiff in King Mastiff in Kingston Mastiff in Kirkland Lake Mastiff in Kitchener Mastiff in Leamington Mastiff in Lindsay Mastiff in Listowel Mastiff in Lively Mastiff in London Mastiff in Manotick Mastiff in Marathon Mastiff in Meaford Mastiff in Midland Mastiff in Milton Mastiff in Mitchell Mastiff in Mount Albert Mastiff in Mount Forest Mastiff in Napanee Mastiff in Newcastle Mastiff in New Hamburg Mastiff in New Liskeard Mastiff in Niagara Falls Mastiff in Nobleton Mastiff in North Bay Mastiff in Orangeville Mastiff in Orillia Mastiff in Oshawa Mastiff in Ottawa Mastiff in Owen Sound Mastiff in Paris Mastiff in Parry Sound Mastiff in Pembroke Mastiff in Perth Mastiff in Petawawa Mastiff in Peterborough Mastiff in Petrolia Mastiff in Picton Mastiff in Port Colborne Mastiff in Port Dover Mastiff in Port Elgin Mastiff in Port Hope Mastiff in Port Perry Mastiff in Prescott Mastiff in Renfrew Mastiff in Richmond Mastiff in Ridgetown Mastiff in Rockland Mastiff in Rockwood Mastiff in Russell Mastiff in Sarnia Mastiff in Sault Ste. Marie Mastiff in Shelburne Mastiff in Simcoe Mastiff in Smiths Falls Mastiff in Smithville Mastiff in Southampton Mastiff in Stayner Mastiff in St Catharines Mastiff in St George Mastiff in St Marys Mastiff in Stouffville Mastiff in Stratford Mastiff in Strathroy Mastiff in St Thomas Mastiff in Sturgeon Falls Mastiff in Sudbury Mastiff in Sutton West Mastiff in Tavistock Mastiff in Thunder Bay Mastiff in Tilbury Mastiff in Tillsonburg Mastiff in Timmins Mastiff in Toronto Mastiff in Tottenham Mastiff in Uxbridge Mastiff in Vineland Mastiff in Walkerton Mastiff in Wallaceburg Mastiff in Wasaga Beach Mastiff in Waterford Mastiff in Welland Mastiff in Wellesley Mastiff in Windsor Mastiff in Woodstock

Mastiff shelters & rescues in Ontario

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

Here are a few organizations

Rescue

Dog Tales Rescue and Sanctuary

1405 19th Sideroad, King City , ON L7B 1K5

Pet Types: cats, dogs

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Rescue

Alliston & District Humane Society

5545 Tosorontio Concession 4, Everett , ON L0M 1J0

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

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Shelter

Toronto Humane Society

11 River Street, Toronto , ON M5A 4C2

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

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Rescue

Team Dog Rescue

200 Bay St., Royal Bank Plaza, PO Box 64043, Toronto , ON M5J 2T6

Pet Types: dogs

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Shelter

Guelph Humane Society

190 Hanlon Creek Blvd, Guelph , ON N1C 0A1

Pet Types: cats, birds, dogs, farm animals, 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 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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