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!

Clementine

Mastiff

Female, 4 yrs

Windsor, ON

Size

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

Details

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.

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Jaxon

Mastiff

Male, 2 yrs

Guelph, ON

Size

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

Details

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!

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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

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London

Mastiff/Boxer

Female, 3 yrs 2 mos

Guelph, ON

Size

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

Details

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/.

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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!

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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!

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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