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!

Dasher (brindle)

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 Dasher Dasher is part of our Emergency Christmas Crew and is a Mastiff x Rottweiler mix (with maybe a little Beagle charm) born September 4, 2025. Dasher has had excellent exposure to kids, adults, and dogs of all sizes and ages, and has shown himself to be a friendly, gentle, and adaptable puppy. He takes new experiences in stride and enjoys being part of the action with his people and canine friends. He is crate trained, working on leash and house manners, and doing very well for his age with only the occasional puppy accident. Dasher enjoys adventures and exercise but is also a loving snuggle bug and happy couch potato when it’s time to relax. As a large-breed puppy, Dasher is expected to grow into a big boy, and his future family will be required to commit to ongoing formal training and continued socialization to help him grow into a confident, well-mannered adult dog. Dasher is very food-driven and highly motivated, which makes him a fantastic candidate for training and learning new skills with positive reinforcement. If you’re looking for a smart, eager-to-please puppy and are ready to invest in his future, Dasher may be the perfect addition to your family For more information of their backstory, check out their welcome post: 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 #AdoptorShopResponsibly Visit this organization's web site to see any additional information available about this pet.January 13, 2026, 1:26 pm

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Cypress (black w brindle)

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 Cypress Cypress is part of our Emergency Christmas Crew and is a Mastiff x Rottweiler mix (with maybe a little Beagle flair) born September 4, 2025. Cypress is being fostered alongside his sister Noel and has had excellent exposure to cats, kids, adults, and dogs of all sizes and ages. He’s a friendly, gentle, and adaptable puppy who does well in a variety of environments and with all kinds of people and animals. He is crate trained, working on leash and house manners, and doing very well for his age with only the occasional puppy accident. Cypress enjoys adventures and exercise but is also a total snuggle bug and couch potato when it’s time to relax. As a large-breed puppy, Cypress is expected to grow into a big boy, and his future family will be required to commit to ongoing formal training and continued socialization to help him become a well-mannered, confident adult dog. Cypress does experience car/motion sickness, so his adopters will need to be patient and prepared to manage this as he grows (many puppies outgrow it with time and positive experiences). If you’re ready to invest in a gentle giant in the making and provide the guidance he needs to thrive, Cypress may be your perfect match For more information of their backstory, check out their welcome post: 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 #AdoptorShopResponsibly Visit this organization's web site to see any additional information available about this pet.January 12, 2026, 7:13 pm

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Noel (red 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 Noel Part of our Emergency Christmas Crew, Noel is a Mastiff x Rottweiler mix (with maybe a little Beagle spice) born September 4, 2025. This sweet girl is being fostered with her brother Cypress and has proven to be incredibly gentle, friendly, and adaptable. She’s great with cats, kids, adults, and dogs of all sizes and ages—a true social butterfly. Noel is crate trained, working on leash and house manners, and doing wonderfully with only the occasional puppy accident. She loves a good adventure and exercise but is just as happy being a couch potato and snuggle bug. As a large-breed puppy, Noel 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. Noel does experience car/motion sickness , so her adopters will need to be patient and prepared to manage this as she grows (many puppies outgrow it with time and positive experiences). If you’re looking for a loving, gentle giant in the making and are ready to invest in her future, Noel may be the perfect addition to your family For more information of 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 12, 2026, 7:13 pm

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Katie

Mastiff

Female, 2 yrs 1 mo

Everett, ON

Size

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

Details

Story

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Kai

Mastiff

Female, 11 yrs 4 mos

Guelph, ON

Size

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

Details

Story

Hello! My name is Kai!I`m a super senior with lots of love to give. I am looking for a calm retirement home where I can lounge in the sun and go for sniffing walks. I am a gentle girl with a sensitive soul. I can be a bit nervous at first but warm up pretty quickly. I love my humans and may whine when I can`t be near them. I would love to join a home where I can be with my human(s) more often than not, as I love to snuggle.MY IDEAL HOME INVOLVES…CHILDREN: No, given my age and sensitive nature, I would do best in a calm, quiet environment.OTHER DOGS: Yes, with a calm and lower energy dog.CATS: Yes, with a cat confident and experienced with dogs.FIRST-TIME DOG OWNERS: Someone with some dog experience, and realistic expectations around the financial commitment of vet visits given my senior age, would be great!FENCED-IN YARD: Not necessarily.HOUSING ENVIRONMENT: I would do best in a home without too many required stairs to travel on a daily basis.SOMEONE HOME MOST OF THE DAY: Not necessarily.SOME OTHER THINGS TO KNOW ABOUT ME…ACTIVITY LEVEL: Low.HOUSE-TRAINED: Yes.If you think I could be a good match for your home, click the “Adopt Me” button to apply!

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Willy

Mastiff

Male, Young

Pembroke, ON

Size

(when grown) -

Details

Good with dogs,

Story

Hi there! I'm Willy - a big-hearted, long-legged goofball who's still figuring out how to use all this growing body of mine (which means you'll catch me being adorably clumsy now and then!). I am shy when I first meet new people or find myself in new situations, but with patience, kindness, and gentle introductions, I gain confidence and let my true personality sparkle.I'm looking for a family who understands that I don't love being rushed and is happy to be my voice, helping others give me the space I need to feel safe. Once I trust you, though - oh boy! - I turn into a joyful burst of happiness. I love playing fetch, zooming around a securely fenced yard, and showing off my silly side. When I'm comfortable, I become a total ham, and I make my care team laugh every single day.If you're someone who believes the best bonds grow with time, patience, and lots of love, I think we might be perfect for each other. Come meet me, and let's start a beautiful adventure filled with laughter, tail wags, and lifelong memories.My special adoption fee includes my neuter, vaccinations, dewormer, microchip, nutritious Royal Canin food, and more - all I'm missing is YOU! Primary Color: Black Brindle Weight: 33.005 Age: 1yrs 0mths 0wks

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

Mastiff puppies and dogs in Ontario

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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!

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Mastiff puppies and dogs in Ontario cities

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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