Mastiff Adoption in Smithville, ON: Mastiff Puppies for Sale in Smithville, ON

Adopt a Mastiff near you in Smithville, Ontario

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These Mastiffs are available for adoption close to Smithville, Ontario.

Coops (20260615-04)

Mastiff Mixed Breed (Medium)

Male, Young

Niagara Falls, ON

Size

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

Details

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

Story

Meet Coops - A Gentle Soul Looking for His Forever Family Coops is a sweet, gentle-hearted young pup with a calm nature and a heart full of love to give. This handsome Mastiff mix was rescued alongside his two brothers after they were found wandering a remote highway in northern Manitoba. Despite his difficult start in life, Coops has shown nothing but kindness, resilience, and a quiet eagerness to trust. At just 7 months old, Coops is still discovering the world around him. He can be shy when meeting new people, but with patience, gentle encouragement, and a loving environment, his confidence continues to grow every day. Having a friendly, well-balanced canine companion in the home would be a huge benefit to this sweet boy, helping him feel safe and learn from a trusted friend. Coops is wonderful with other dogs and absolutely amazing with cats. He also does well with children and has a soft, gentle temperament that makes him a joy to be around. He enjoys car rides, is learning to walk on leash, and approaches life with a playful and inquisitive spirit. Coops has conquered house training and crate training with flying colours. He is not food aggressive, is comfortable being handled, and has shown no leash reactivity toward people or other dogs. Coops would thrive in a home with a secure yard, another friendly dog, and a family committed to helping him continue building his confidence. While he isn't suited to apartment living, he will make a wonderful companion for someone willing to give him the time, patience, and love he deserves. Could Coops be the missing piece your family has been searching for? This sweet, soulful boy is waiting for a patient and loving home where he can continue to blossom into the amazing companion he was always meant to be. Good with Men: Yes, shy at first Good with Women: Yes, shy at first Good with Kids: Yes Good with dogs: Yes Good with cats: Yes Housetrained: Yes Crate trained: Yes Energy level: Medium Can be handled/touched: Yes Flight risk: No Walks on leash: Working on it Leash reactive to people or dogs: No Rides well in car: Learning Food aggressive: No Destructive: Puppy Needs a yard: Yes Needs another dog: Yes Can live in an apartment: No Please visit our website niagaradogrescue.com to learn more about this amazing pet and to see other available dogs.

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Spotty Dotty (20260625-05)

Mastiff Mixed Breed (Medium)

Female, Adult

Niagara Falls, ON

Size

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

Details

Good with kids, Good with dogs, Spayed or Neutered,

Story

Meet Spotty Dotty! Spotty Dotty's story began with heartbreak, but her future is filled with hope. Found abandoned in Northern Manitoba, Spotty Dotty spent weeks waiting faithfully for her owners to return. Sadly, no one ever came back for her. By the time caring neighbours found her, she was severely underweight and starving, yet she never lost her gentle spirit. Since arriving in foster care, Spotty Dotty has flourished. She has settled beautifully into her foster home, adores her foster dog siblings, and has shown everyone what a truly special dog she is. Despite everything she has endured, she remains incredibly affectionate, loving, and trusting. Spotty Dotty is a cuddle enthusiast who loves being close to her people. She has a calm and gentle demeanor that is remarkable for a dog her age and makes her a wonderful companion for a family looking for a loyal best friend. Her sweet nature, kind heart, and quiet resilience shine through in everything she does. Having experienced more hardship than any dog should, Spotty Dotty deserves a family who will cherish her and show her the love she has always deserved. In return, she will reward you with unwavering loyalty, endless affection, and a lifetime of companionship. You won't regret opening your heart to Spotty Dotty. She is truly a treasure-a gentle, loving soul who is ready to spend the rest of her life knowing she is safe, wanted, and loved. Medical notes: Extremely thin Crate size recommended: XL Good with women: yes Good with men: yes Good with kids: yes Good with other dogs: yes Good with cats: untested House trained: yes Crate trained: yes Energy level: medium Can be handled/touched: yes Barker: no Flight risk: no; however all dogs should be considered flight risks in new environments Food aggressive: no Current food: kibble Walks on leash: yes Leash reactive to people or dogs: no Rides well in car: unknown Destructive: no Needs a home with a yard: yes Needs a home with another dog: not necessarily but likes other dogs Can live in an apartment: no Please visit our website niagaradogrescue.com to learn more about this amazing pet and to see other available dogs.

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Mastiff

Male, 6 yrs

Toronto, ON

Size

(when grown) X-Large 101 lbs (46 kg) or more

Details

House-trained, Spayed or Neutered, Shots are up-to-date,

Story

Meet HK, an all-star walking companion who is frequently called the best guy by the volunteers and staff who adore him! If you are looking for a clever, treat-motivated dog who loves to learn, HK is ready to impress you. HK is a sweet and enthusiastic gentleman who is an absolute joy to take on outdoor adventures. HK loves spending time with his people — he’ll happily lean in for cuddles and soak up all the affection you’re willing to give. His favorite things include treats, exploring new places, and being your loyal sidekick wherever the day takes you. Recently during training games, he has been displaying excellent handler focus. Responsive to verbal encouragement, he has learned to happily check in and disengage from distractions for a tasty treat. After a fun, engaging walk, he loves winding down with a great petting session and lots of affection. HK may be happiest as the only dog in the home, where he can soak up all the attention and continue building his confidence out in the world. If you are looking for a smart, loving partner for your daily walks, couch cuddles and training adventures, come meet HK today!

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India

Mastiff Rottweiler

Female, Adult

Toronto, ON

Size

(when grown) X-Large 101 lbs (46 kg) or more

Details

Good with kids, House-trained, Spayed or Neutered,

Story

India Rottweiler/Boxer/Dogo Argentino mix (short coat) Large Adult Female This gorgeous brindle gal is India a 4 year old, 100 pound mixed breed dog who will be up to date on her veterinary care and spayed prior to adoption. Her current family is not able to provide her with the time or care she deserves. India is housetrained and crate trained, although, a crate has not been used in the past year or so. She is used to living in an apartment and is said to be quiet and comfortable being left alone while her family works full-time hours. She may whine initially when left in a new environment. She enjoys daily walks for exercise and to do her business. India is a Mastiff mix, and as such, will most likely become very attached to her family members but may initially be a bit wary of new people and animals. She warms up to women more quickly than men. India is currently living with 2 toddlers and is good with them. India has very limited experience with other dogs and has not lived with another dog. She has a Husky friend she likes to interact with on leash. She may react to other dogs when on leash walks who are as far away as on the other side of the street and needs a strong and confident owner to help her work through this behaviour using positive reinforcement based methods. She has also never lived with a cat. Her family is able to bathe and brush her and she has been professionally groomed. Her regular groomer says she is good for grooms. At the veterinarian, she is muzzled for invasive handling. Muzzles can be a great tool to help dog handlers feel safe. If you are looking for a loyal, large breed dog to snuggle with on the couch and believe you can provide India with the care she deserves, please fill out the Adoption Application on our website. Due to time constraints, we cannot respond to every email asking for more information on a dog. Please carefully review the bio for the dog and our adoption process https://www.speakingofdogs.com/adoption/adoption-process/. If you are still interested in adopting, please fill out the adoption application form at the bottom of that page. July 29, 2026, 10:42 pm

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Lilah

Rhodesian Ridgeback Mastiff

Female, 2 yrs

Hamilton, ON

Size

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

Details

House-trained, Spayed or Neutered, Shots are up-to-date,

Story

Hi! I'm Lilah, and I'm currently accepting applications for my forever family. A few things you should know about me: I firmly believe that personal space is overrated. If you're sitting down, congratulations — you've just become my couch buddy. If I can fit on your lap, I'm going to give it my best shot. My hobbies include squeaking soft toys, solving the incredibly important puzzle known as "How do I get these treats out of this Kong?", and collecting compliments about what a good girl I am. I'm pretty polite on leash! I like to walk out front to see what's happening, but I listen when my person asks me to slow down. Since I'm still a young lady, I'd love to keep learning with some training classes. I hear they're a great way to earn snacks! My energy level is low to medium, which means I'm always up for an adventure, but I'm equally happy hanging out with my people afterward. I came to the shelter as an unclaimed stray, and while I have some scars on my head and legs that hint at a story we'll probably never know, they don't define who I am. What does define me is my sweet, gentle heart. The shelter staff absolutely adore me and honestly, the feeling is mutual. I was a rock star during my medical exam, letting everyone handle me without a fuss. Apparently, not everyone enjoys blood draws... but I figured being brave was the way to go! I may even enjoy having a calm, polite canine roommate one day, as long as we're introduced nice and slowly. So, if you've been searching for a loyal sidekick, an expert cuddle consultant, and a dog whose greatest ambition is simply to love her people with her whole heart, I think we should meet. I promise to bring the snuggles, the squeaky toy entertainment, and the unconditional love. All you have to do is bring me home. Please complete an adoption application: https://www.hamilton.ca/home-neighbourhood/animals-pets/adopt-or-foster-pet/adoptions. 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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Chippy (20260509-01)

Shepherd (Unknown Type) Mastiff

Male, Adult

Niagara Falls, ON

Size

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

Details

Good with kids, Good with dogs, Good with cats, Spayed or Neutered,

Story

Brutus and his brother Chippy were born to a Shepherd mix Mom and a Mastiff mix dad. They are loved by their family but sadly must be surrendered because a community member who dislikes dogs has threatened them so the decision was made for the dogs safety.Chippy has a playful energy while still keeping that sweet, easygoing temperament. He's great with people, kids, and other dogs, and is house-trained and respectful in the home. Chippy loves a good game of fetch-especially if it involves a ball he can proudly (and eventually destroy) carry around. If you've got sticks, toys, or even a woodpile that needs "help," he's your guy.Chippy and his brother have been used to a more rural area so would do well with the same or a quiet suburban area with a yard. He's not much of a barker and enjoys a balance of playtime and relaxation. Chippy would thrive in a home where he can stay active chasing some balls or retrieving sticks to have fun, and be part of the family he so clearly loves to be around. Good with men: YesGood with women: YesGood with kids: YesGood with dogs: YesGood with cats: YesHousetrained: YesCrate trained: NoCan be handled/touched: YesEnergy level: MediumFlight risk: All newly adopted or fostered dogs are a flight riskFood aggressive: NoBarker: NoWalks on leash: No, needs trainingLeash reactive to people or dogs: NoRides well in car: UnknownDestructive: NoNeeds a home with a yard: YesNeeds a home with another dog: NoCan live in an apartment: No Please visit our website niagaradogrescue.com to learn more about this amazing pet and to see other available dogs.

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Mastiff puppies and dogs in Smithville, Ontario

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Adopt a Mastiff near you in Smithville, Ontario

We don't see any Mastiffs available for adoption right now, but new adoptable pets are added every day. Try a different search below!

Or, how about these Mastiffs in cities near Smithville, Ontario

These Mastiffs are available for adoption close to Smithville, Ontario.

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Mastiff puppies and dogs in nearby cities

Related breeds in Smithville, Ontario

Mastiff shelters & rescues in Smithville, Ontario

Looking for a specific shelter or rescue?

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

Mastiff basics

Mastiff basics