Mastiff Adoption in Oceanside, CA: Mastiff Puppies for Sale in Oceanside, CA

Adopt a Mastiff near you in Oceanside, California

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 Oceanside, California

These Mastiffs are available for adoption close to Oceanside, California.

Opal

Mastiff

Female, Adult

Escondido, CA

Size

(when grown) -

Details

Spayed or Neutered,

Story

How Opal arrived: Opal was brought in by our Humane Law Enforcement team on January 18, 2026. Why Opal is the one for you:Opal is a big, beautiful bundle of sweetness with a heart as soft as her name suggests. Though the world can feel scary to her at times, she faces it with gentle bravery-especially when a little cheese is involved. At 113 pounds of pure love, Opal's warmth is felt in every slow tail wag and trusting lean. Her sensitivity, affection, and cheese-powered courage make her an unforgettable, lovable soul. At SDHS:Opal has been vaccinated, microchipped and neutered. Opal is now ready for her new home! Primary Color: Black Brindle Weight: 116.6 Age: 4yrs 1mths 0wks

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Gus

English Mastiff

Male, 6 yrs 10 mos

San Diego, CA

Size

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

Details

Good with kids, Good with dogs, House-trained, Spayed or Neutered, Shots are up-to-date,

Story

Meet Gus Gus is an 8-year-old black Mastiff with a heart as big as his paws. Found as a stray in Ontario alongside his friend—possibly his daughter—Tavi, Gus has shown nothing but gentle, loving energy. While they would love to find a home together, they can be adopted separately if needed. Weighing in at approximately 115 lbs, Gus is a true gentle giant. He’s the sweetest big boy who lives for chew sticks, affection, and cozy snuggles. Gus would be perfectly happy spending his days as a couch potato, soaking up love and giving it right back. He is housetrained and has wonderful manners, making him an easy, loving companion for a calm home looking for a loyal best friend. ##2648733##

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Jughead

Mastiff American Staffordshire Terrier

Male, 2 yrs 11 mos

San Diego, CA

Size

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

Details

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

Story

Meet Jughead! DOB: March 2023Weight: 70lbsDisposition: Jughead is a friendly and curious boy who loves nothing more than exploring the outdoors. He's a natural on the trails and is working on his leash manners so he can be the best hiking partner possible. When he's not adventuring, he's busy with his toys, treating them with a surprising amount of care before he finally lets loose and has a blast. He loves his people and is looking for someone who can help him work on building his focus and attention span.History: Rescued from a shelter in LA County by TBL in March 2025Best Home: A family (or single person) looking for a loyal companion to join you on your adventures and a sweet boy to cuddle up with at the end of the day.Amazing Qualities: Jughead is curious and confident! He's ready to explore the world.If you're interested in meeting this dog, please visit our website to fill out an adoption application: www.thebarkinglot.net/adoptOur dogs are located in San Diego County, CA. We will happily consider out of town applications and can conduct virtual play dates with interested adopters. We have monthly transport to various locations in the Pacific Northwest, individual arrangements would need to be made for other locations across the US and Canada.To initiate the adoption process for this dog, please complete our online application by clicking below. Your adoption coordinator will respod to you via email once they receive your application: www.thebarkinglot.net/adopt

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Buttercup

Mastiff Belgian Malinois

Female, 1 yr 4 mos

Temecula, CA

Size

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

Details

Good with kids, Good with dogs, Good with cats, House-trained, Shots are up-to-date,

Story

Meet Buttercup – The Smart, Alert, and Sweet Girl Ready for Her Forever Home Buttercup is the perfect mix of intelligence, curiosity, and sweetness! Born on 10/26/24, this Mastiff and Malinois mix is always alert and eager to learn, making her a great fit for an active home that will nurture her sharp mind. While she’s incredibly smart, Buttercup also has a gentle and loving side—she enjoys affection, playtime, and bonding with her humans. Like her littermates, she’s been with a trainer, well-socialized and potty trained, giving her a great foundation to thrive in her future home. Up to date on vaccines Intelligent, curious, and affectionate Crate trained and potty trained If you’re looking for a smart and loving pup who will be your loyal companion, Buttercup is your girl! Apply to adopt or foster today—don’t forget to mention Buttercup’s name! Professionally trained in basics (sit, stay, walking on leash, etc) Foster-to-adopt option available Got inquiries about Buttercup? Click here to fill out our inquiry form (this is not an application): https://petstablished.com/petlover/general_form/71282 ##2313586##

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Tiger

Mastiff Belgian Malinois

Male, 1 yr 3 mos

Temecula, CA

Size

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

Details

Good with kids, Good with dogs, Good with cats, House-trained, Shots are up-to-date,

Story

Meet Tiger – The Confident Leader with a Heart of Gold! Tiger is ready to lead his way into your heart! Born on 10/26/24, this sweet Mastiff and Malinois mix is a natural leader —confident and curious. But don’t let his strong presence fool you—he’s also incredibly lovable, affectionate, and eager to bond with his humans. Tiger is a well-rounded boy who enjoys both playtime and cuddles. He’s been well-socialized and is potty trained, making him a great addition to a loving home. Whether he’s leading the charge on a new adventure or snuggling up for some quality time, Tiger is the perfect balance of strength and sweetness. Up to date on vaccines Confident, affectionate, and a great companion Crate trained and potty trained Professionally trained in basics (sit, stay, walking on leash, etc) Foster-to-adopt option available If you’re looking for a brave, smart, and loving boy to be your loyal companion, Tiger is your perfect match! Apply to adopt or foster today—don’t forget to mention Tiger’s name! ##2313590##

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Toothless

Mastiff Belgian Malinois

Male, 1 yr 3 mos

Temecula, CA

Size

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

Details

Good with kids, Good with dogs, Good with cats, House-trained, Shots are up-to-date,

Story

Meet Toothless – The Energetic, Goofy, and Strong Boy Ready for Adventure! Toothless has a personality as big as his playful heart! Born on 10/26/24, this sweet Mastiff and Malinois mix is bursting with energy, always ready to zoom around and explore the world with his goofy charm. He’s strong, confident, and full of fun, making him the perfect pup for an active household. Toothless is not just about high energy—he’s also a sweetheart who loves affection and human connection. Well-socialized, crate trained and potty trained, he’s a smart boy who will thrive in a home that gives him structure, love, and lots of playtime. Toothless is great on outings - check out his photos. Up to date on vaccines Playful, strong, and always ready for fun Crate trained and potty trained Professionally trained in basics (sit, stay, walking on leash, etc) Foster-to-adopt option available If you’re looking for a goofy, adventurous, and lovable boy to keep you on your toes, Toothless is your guy! Apply to adopt or foster today—don’t forget to mention Toothless’ name! ##2313604##

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These pups are in Oceanside, California too!

Below are our newest added Mastiffs available for adoption in Oceanside, California. To see more adoptable Mastiffs in Oceanside, California, use the search tool below to enter specific criteria!

Fiona

Neapolitan Mastiff

Female, Adult

Riverside, CA

Size

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

Details

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

Story

Meet Fiona 💕 Fiona is a beautiful Neapolitan Mastiff estimated to be around 3 years old. It’s very clear that she was used extensively for breeding before coming to us, and despite everything she’s been through, she is nothing short of incredible. She is incredibly sweet, gentle, and affectionate. Fiona has a playful side but is overall a super chill, easygoing girl who truly loves the simple things like cuddling, belly rubs, and being close to her people. She has the kindest soul and a very soft presence. Fiona is non-reactive and tolerant around other dogs, but she would do best as the only dog in the home. Due to the heavy facial folds common in her breed, her vision is not the best, so fast-moving dogs, especially during playful moments can sometimes startle her. She does have severe hip dysplasia, likely a result of being bred repeatedly, and she will need a home that understands and can manage her orthopedic needs. When Fiona arrived, she was very underweight, but with proper care and nutrition, she is slowly and steadily putting healthy weight back on. We are looking for a home with mastiff or giant breed experience, someone who understands her structure, limitations, and the special care she deserves. One of the sweetest things about Fiona? Sometimes she sings and it is absolutely adorable. Fiona has so much love to give and deserves a calm, understanding home where she can finally just be a dog, loved, safe, and cherished by her humans. If interested in meeting Fiona, please apply on our website today! https://www.underdogheroes.org/applytoadopt

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Clifford

Bullmastiff

Male, Young

Oceanside, CA

Size

(when grown) -

Details

Spayed or Neutered,

Story

How this pet arrived: Clifford was brought in by a community member on January 30, 2026. Why this pet is the one for you:Meet Clifford (yes... he really is big). True to his name, Clifford is a big dog with a big heart-and sometimes big feelings too. This gentle giant can feel unsure around new people, especially men, so he needs humans who will proudly advocate for his space on walks and when visitors come over. Giving him time and calm introductions helps him feel safe. Clifford's size may be impressive, but his nature is soft and sensitive. He's best suited to a home with children aged 8 and up who can respect his boundaries. Clifford came to us as a stray, so his past is a bit of a mystery, but he's ready to grow something even bigger than himself: trust, confidence, and a home.Shy/Fearful Dog: This pet requires a virtual behavior consult, please watch THIS video to learn more about them. Primary Color: Red Weight: 134.4 Age: 1yrs 10mths 3wks

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Use the search tool below to browse adoptable Mastiff puppies and adults Mastiff in Oceanside, California.

Mastiff puppies and dogs in Oceanside, California

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Adopt a Mastiff near you in Oceanside, California

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 Oceanside, California

These Mastiffs are available for adoption close to Oceanside, California.

These pups are in Oceanside, California too!

Below are our newest added Mastiffs available for adoption in Oceanside, California. To see more adoptable Mastiffs in Oceanside, California, use the search tool below to enter specific criteria!

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Mastiff puppies and dogs in Oceanside, California

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Adopt a Mastiff near you in Oceanside, California

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 Oceanside, California

These Mastiffs are available for adoption close to Oceanside, California.

These pups are in Oceanside, California too!

Below are our newest added Mastiffs available for adoption in Oceanside, California. To see more adoptable Mastiffs in Oceanside, California, use the search tool below to enter specific criteria!

Search for a Mastiff puppy or dog

Mastiff puppies and dogs in nearby cities

Related breeds in Oceanside, California

Mastiff shelters & rescues in Oceanside, California

Looking for a specific shelter or rescue?

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

Mastiff basics

Mastiff basics