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!

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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Berkley

Mastiff/Labrador Retriever

Female, Young

Orangeville, ON

Size

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

Details

Story

Meet Berkley 💚🐾,A young dog with a heart full of love and a mind brimming with curiosity. Berkley's friendly demeanor makes her a great companion, always ready to greet you with a wagging tail. Her independent nature ensures she's content exploring or relaxing on her own, while her bravery and intelligence make her a quick learner and a fun playmate. Loyalty is Berkley's middle name, promising a bond that grows stronger each day. Adopt Berkley and discover the joy of a true friend who brings endless excitement and affection into your life.I don't need much, just a loving home. Adopting me would mean a loyal friend for life, a quiet companion who'll always be there. For more information, please email orangeville@ontariospca.ca (please check your junk mail) and include your phone number so we can better contact you. Otherwise. please stop by for a visit and I would be happy to meet you!I can't wait to come home to you! 💙 - Berkley 💚🐾 Primary Color: Brindle Weight: 35.5 Age: 1yrs 0mths 0wks

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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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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 16, 2026, 8:24 am

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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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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

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