Mastiff Adoption in Ontario: Mastiff Puppies for Sale in Ontario

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!

Stella

Mastiff

Female, Adult

Orillia, ON

Size

(when grown) -

Details

Story

Stella is a sweet, loving female dog with a heart full of affection and a tail that never stops wagging. She is friendly and adores people - especially anyone who's ready to share some belly rubs or go for fun walks. Stella is looking for a forever home where she can be part of the family, get lots of love, and enjoy all the treats and adventures life has to offer. 💛If you're ready to open your heart and home to a loyal new companion, Stella might just be the perfect fit!📍 Adoption Contact:📞 Phone: (705) 325-1304📧 Email: orillia@ontariospca.ca Primary Color: Brindle Secondary Color: White Weight: 37.007 Age: 2yrs 6mths 0wks

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Paris

Mastiff

Female, 3 yrs

Hamilton, ON

Size

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

Details

Needs experienced adopter, House-trained,

Story

Paris may share a name with a fashion capital, but she’s proudly rocking a more “wrinkly jowls” than “runway couture” look - and honestly, it just adds to her charm. This 3-year-old Mastiff cross came to the shelter as an unclaimed stray with another dog, and since then she’s been winning hearts left, right, and at every red light. Paris is basically a giant puppy in a grown-dog body. When she’s out of her kennel, she’s all joy, bounce, and enthusiasm, complete with happy jumps and a “LET’S DO THINGS!” attitude. She’s strong (very strong), so she’ll need a confident, sturdy human who can handle her power while she learns the ropes. Obedience classes will be right up her alley - Paris is eager, food-motivated, and would love the chance to learn some manners and show off her brains. An EasyWalk harness would be a great tool to help manage her leash-pulling enthusiasm while she’s learning. Adventure is Paris’s love language. She lives for walks and would be thrilled to join an active family who enjoys exploring the world with her. When it’s time to relax indoors, food puzzles are a fantastic way to keep her big brain busy and her jowls happily occupied. And then there’s her snuggle game, which is truly elite. One volunteer reports that Paris knew she was getting a much shorter walk than usual but she was totally fine with it, as long as she could stretch up for a good snuggle. She happily stayed there, soaking up affection like it was her full-time job. In fact, Paris has accidentally become a master of marketing. While wearing her “Adopt Me” leash near a busy intersection, she calmly sat through 30 - 40 drive-bys, charming passersby as traffic slowed at red lights. It turns out the perfect recipe for subversive marketing is a dog who’s patient, affectionate, and unbothered by the world going by - and Paris nailed it (wrinkles, drool, and all). Sweet, strong, snuggly, and hilariously mastiff-y, Paris would make a wonderful companion for someone with the time, patience, and love to help her shine. If you’re looking for a dog who’s more heart than high fashion—and who gives exceptional hugs—Paris just might be your girl. Please complete an adoption application: https://www.hamilton.ca/home-neighbourhood/animals-pets/adopt-or-foster-pet/adoptions Paris has an appointment to be spayed on January 27th. She will be ready to go to her forever home after this surgery. Animal adoptions and viewing are by appointment only. This allows our Adoption Staff to spend quality time with each potential home to ensure the most successful matches are made between the animals and their new families. *Please note: we only adopt within Ontario

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Thor

Mastiff/American Bulldog

Male, Young

Keswick, ON

Size

(when grown) -

Details

Story

Hello there! My name is Thor, Male - neuteredMastiff x American Bulldog MixApprox. 1 year, 8 months oldI'm a big lovable marshmallow in a BIG package. You'll find that my heart is just as large as my frame, and I'm ready to share all the love I have with my forever family.When it comes to people, I'm friendly but can be a little nervous, especially around sudden movements. I thrive best with slow and gentle introductions. Once I feel comfortable, I'm your classic wiggle bug, eager to make friends and soak up all the affection you have to offer.I haven't quite figured out which toys I like best yet, but I'm excited to explore and find my favourites with you! What really gets my tail wagging is praise, treats, and people. I'm highly motivated by love and snacks, which will make training and bonding with me a delightful experience.I'm still working on my basic training, which means we can learn together. With your guidance and a few tasty treats, I'm sure to pick up on commands and become the well-mannered companion you're looking for.So, if you're looking for a gentle giant who will fill your home with love and laughter, I'm your guy. Primary Color: Black Brindle Secondary Color: Black Brindle Weight: 41.2 Age: 1yrs 8mths 1wks

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Navidad 'Navi' (red)

Mastiff/Rottweiler

Male, Puppy

Oro Medonte, ON

Size

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

Details

Good with kids, Good with dogs, Good with cats,

Story

You can fill out an adoption application online on our official website.Meet Navidad “Navi” Part of our Emergency Christmas Crew, Navi is a Mastiff x Rottweiler mix (with maybe a little Beagle flair) born September 4, 2025. This playful boy has proven to be incredibly social with people, cats, and dogs. He’s done wonderfully with cats, kids, adults, and dogs of all sizes and ages—a confident, happy puppy who loves being right in the middle of the action. Navi is crate trained, working on leash skills and house manners, and doing very well for his age with only the occasional puppy accident. He enjoys adventures and exercise but is just as content being a snuggle bug. He’s very food-driven and highly motivated, making him a fantastic candidate for training and learning new skills through positive reinforcement. If you’re looking for a smart, eager-to-please puppy and are ready to invest in his future, Navi may be the perfect fit. Navi does experience car/motion sickness, so his adopters will need to be patient and prepared to help manage this as he grows (many puppies outgrow it with time and positive experiences). As a large-breed puppy, Navi is expected to grow into a big boy. His future family should be committed to ongoing formal training and continued socialization to help him mature into a well-mannered, confident adult dog. If you’re looking for a playful, social, and loving pup, Navi could be the perfect addition to your family For more on his backstory: https://www.facebook.com/share/p/17nfLJ7gtm/?mibextid=wwXIfr Apply to adopt and give this Christmas boy the forever home he deserves: https://www.hankshaven.ca/info/adoption #EmergencyChristmasCrew #PuppyForAdoption #AdoptOrShopResponsiblyVisit this organization's web site to see any additional information available about this pet.January 14, 2026, 7:26 pm

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Tinsel (fawn w black snout)

Mastiff/Rottweiler

Female, Puppy

Oro Medonte, ON

Size

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

Details

Good with kids, Good with dogs, Good with cats,

Story

You can fill out an adoption application online on our official website.Meet Tinsel Part of our Emergency Christmas Crew, Tinsel is a Mastiff x Rottweiler mix (with maybe a little Beagle spice) born September 4, 2025. This sweet girl has proven to be incredibly social with people, dogs, and cats. She’s done wonderfully with cats, kids, adults, and dogs of all sizes and ages—a confident, happy puppy who truly loves being part of the action. Tinsel is crate trained, working on leash skills and house manners, and doing very well for her age with only the occasional puppy accident. She enjoys adventures and exercise but is just as happy curling up as a snuggle bug. She’s very food motivated and exceptionally bright, often picking up commands and training quickly, making her a fantastic candidate for continued learning and formal training. Tinsel does experience car/motion sickness, so her adopters will need to be patient and prepared to help manage this as she grows (many puppies outgrow it with time and positive experiences). As a large-breed puppy, Tinsel is expected to grow into a big girl. Her future family will need to be committed to ongoing training and continued socialization to help her develop into a well-mannered, confident adult dog. If you’re looking for a smart, social, loving pup who would thrive with a canine companion, Tinsel may be the perfect addition to your family For more on her backstory: https://www.facebook.com/share/p/17nfLJ7gtm/?mibextid=wwXIfr Apply to adopt and give this Christmas girl the forever home she deserves: https://www.hankshaven.ca/info/adoption #EmergencyChristmasCrew #PuppyForAdoption #AdoptOrShopResponsiblyVisit this organization's web site to see any additional information available about this pet.January 14, 2026, 11:16 am

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Juniper (cream w fawn)

Mastiff/Rottweiler

Female, Puppy

Oro Medonte, ON

Size

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

Details

Good with kids, Good with dogs, Good with cats,

Story

You can fill out an adoption application online on our official website.Meet Juniper Part of our Emergency Christmas Crew, Juniper is a Mastiff x Rottweiler mix (with maybe a little Beagle spice) born September 4, 2025. This sweet girl was fostered with her brother Dasher and has proven to be incredibly social with both people and dogs. Juniper truly thrives on companionship, and we believe she would do best in a home with other canine friends to play with and learn from. She has done wonderfully with cats, kids, adults, and dogs of all sizes and ages—a confident, happy puppy who loves being part of the action. Juniper is crate trained, working on leash and house manners, and doing very well for her age with only the occasional puppy accident. She loves adventures and exercise but is equally happy being a snuggle bug. She also appears to be the brightest of the litter, often being the first to pick up on commands and training, making her a fantastic candidate for continued learning and formal training. As a large-breed puppy, Juniper is expected to grow into a big girl, and her future family will need to be committed to ongoing formal training and continued socialization to help her grow into a well-mannered, confident adult dog. If you’re looking for a smart, social, loving pup who would thrive with a canine companion, Juniper may be the perfect addition to your family For more information on their backstory, check out their welcome post: https://www.facebook.com/share/p/17nfLJ7gtm/?mibextid=wwXIfr Apply to adopt and give this Christmas girl the forever home she deserves: https://www.hankshaven.ca/info/adoption #EmergencyChristmasCrew #PuppyForAdoption #AdoptOrShopResponsiblyVisit this organization's web site to see any additional information available about this pet.January 13, 2026, 6:36 pm

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Mastiff puppies and dogs in Ontario

Jump to:

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!

Search for a Mastiff puppy or dog

Mastiff puppies and dogs in Ontario cities

Mastiff shelters & rescues in Ontario

Looking for a specific shelter or rescue?

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

Mastiff information

Mastiff basics