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Mastiff puppies and dogs in San Carlos, California

Looking for a Mastiff puppy or dog in San Carlos, California? Adopt a Pet can help you find an adorable Mastiff near you.

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Adopt a Mastiff near you Mastiff in cities near San Carlos, California Other pups in San Carlos, California Search for a Mastiff puppy or dog near you Browse Mastiff puppies and dogs in nearby cities Browse related breeds in San Carlos, California Mastiff shelters and rescues in San Carlos, California Learn more about adopting a Mastiff puppy or dog

Adopt a Mastiff near you in San Carlos, 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 San Carlos, California

These Mastiffs are available for adoption close to San Carlos, California.
We'll also keep you updated on Romeo's adoption status with email updates.
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Romeo

Mastiff

Male, 6 yrs 7 mos
Palo Alto, CA
Size
(when grown) X-Large 101 lbs (46 kg) or more
Details
Not good with dogs, Not good with cats, Needs experienced adopter, House-trained, Spayed or Neutered, Shots are up-to-date,
Story
Romeo is very sweet 6 year old boy but the vets think he may be younger. He would love to be a family dog and definitely wants to find his forever home, but can be protective of his people and his space. That being said once he knows you are part of the family he listens very well and knows many commands, sit, stay, down, shake, wait. He is slow to warm up to new people but once he has been introduced to you he is a gentle giant and big couch potato that loves to cuddle. He also really enjoys going for a ride in the car. It is not recommended to have young kids due to his size. He is good on the leash and knows many commands but needs someone that is not afraid of his size and can properly handle him. Experienced adopter with larger breeds is a must. No other dogs or animals in the household and not a good candidate for crates.

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We'll also keep you updated on Rosco's adoption status with email updates.
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Rosco

Mastiff

Male, Young
Sunnyvale, CA
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Good with kids, Good with dogs, Good with cats, House-trained, Spayed or Neutered, Shots are up-to-date,
Story
Rosco is a loving, affectionate dog looking for his perfect forever home. I adopted him from the San Jose Animal Center about two years ago when he was just 6 months old, and he’s now around 2–3 years old. Unfortunately, I don’t have the time or resources to give him the attention and training he deserves, so I’m hoping to find someone who can. Rosco is a gentle, clumsy giant with a heart of gold. He’s very sweet and docile and loves being close to his people. Rosco is crate trained and knows several commands, including sit, down, place, stay, and go eat. He would thrive in a home with a yard or outdoor space where he can stretch his legs and go to the bathroom easily. I’ll include his crate if needed.

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We'll also keep you updated on She-Ra's adoption status with email updates.
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She-Ra

Mastiff

Female, 5 yrs
Dublin, CA
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Shots are up-to-date,
Story
She-Ra is a female Mastiff. She is approximately five years old, and currently weighs 93 pounds. She was brought to our shelter on 11/17/25 after being found in unincorporated Livermore. She hasn't been reclaimed by her previous person, so she's now looking for a new home! She has been vaccinated, and will be spayed and micro-chipped before going to her new home. Her adoption fee is $35, plus licensing (if applicable), plus the cost of her spay surgery.

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We'll also keep you updated on She-Ra - ECAS's adoption status with email updates.
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She-Ra - ECAS

Mastiff Mixed Breed (Medium)

Female 5 yrs
Pleasanton, CA
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
-
Story
She-Ra was brought to our shelter on 11/17/25 after being found in unincorporated Livermore. She hasn't been reclaimed by her previous person, so she's now looking for a new home! Her adoption fee is $35, plus licensing (if applicable), plus the cost of her spay surgery. She-Ra’s Shelter ID# is 88279. She is an approximately 5-year-old, black, Mastiff mix. She currently weighs around 93 lbs. She has already been vaccinated and will be spayed and microchipped before going to her new home. She-Ra is located in kennel C-2. ** Age shown is an estimate only ** THIS IS A COURTESY POSTING If you are interested, please call the East County Animal Shelter at 925-803-7040 to see if this dog is still available.

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We'll also keep you updated on Rex's adoption status with email updates.
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Rex

Mastiff Mixed Breed (Large)

Male, 1 yr 9 mos
Pleasanton, CA
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
Spayed or Neutered,
Story
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We'll also keep you updated on COFFEY's adoption status with email updates.
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COFFEY

Mastiff

Male, 2 yrs
Martinez, CA
Size
(when grown) Large 61-100 lbs (28-45 kg)
Details
-
Story
-

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

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Mastiff puppies and dogs in nearby cities

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Related breeds in San Carlos, California

Bullmastiffs in San Carlos, California Neapolitan Mastiffs in San Carlos, California Saint Bernards in San Carlos, California

Mastiff shelters & rescues in San Carlos, California

There are animal shelters and rescues that focus specifically on finding great homes for Mastiff puppies in San Carlos, California. Browse these Mastiff rescues and shelters below.

Here are a few organizations closest to you:

Rescue

8.5 miles

Silicon Valley Animal Rescue

Palo Alto, CA 94303

Pet Types: dogs

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Shelter

23.7 miles

East County Animal Shelter

4595 Gleason Drive, Dublin, CA 94568

Pet Types: cats, birds, dogs, rabbits, small animals

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Rescue

24.2 miles

Tri-Valley Animal Rescue

PO Box 11143, Pleasanton, CA 94588

Pet Types: cats, dogs

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Rescue

24.2 miles

California Bully Rescue

Pleasanton, CA 94588

Pet Types: dogs

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Shelter

34.9 miles

Contra Costa Animal Services Martinez

4800 Imhoff Place, Martinez, CA 94553

Pet Types: cats, birds, dogs, farm animals, horses, rabbits, reptiles, small animals

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Shelter

42.4 miles

Humane Society of the North Bay

1121 Sonoma Blvd., Vallejo, CA 94590

Pet Types: cats, dogs

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Looking for a specific shelter or rescue?

If you're not seeing what you're looking for, try our shelter and rescue search. We have more than 17,000 organizations in our database with furry pals waiting for a new home!

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

We've got all the info you need on adopting and caring for a Mastiff puppy. Check out the links below for everything you ever wanted to know about Mastiff puppies and adults.

Mastiff basics

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Where do Mastiffs come from? How many types of Mastiffs are there? From the history of the breed to question about average height, weight and size, brush up on these basic facts about the Mastiff.

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