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

Adopt a Mastiff near you in Napa, 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 Napa, California

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

Olaf

Mastiff

Male, Adult

Vallejo, CA

Size

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

Details

Spayed or Neutered,

Story

IMPORTANT NOTES! PLEASE READ:1. We may not receive anything via forms submitted through PetFinder or Adopt-A-Pet!2. Please submit the adoption interest application directly at our HSNB website!https://www.hsnb.org/dog-adoption-application3. Your application is NOT complete until you submit the necessary housing documentation per the application instructions! To avoid delays, submit this within the application.3. If you do not receive the automated confirmation from us, email adoptions@hsnb.org -----Olaf - A Gentle Giant with a Big Heart 🤍🐾If you love big dogs with even bigger hearts, Olaf might be your perfect match. This handsome 3½-year-old grey Mastiff weighs about 95 pounds and has already earned a wonderful reputation at the shelter as a true gentle giant.Despite his impressive size, Olaf has a calm and easygoing nature. Staff have been especially impressed with how nicely he walks on a leash - something not every big dog masters so gracefully! He enjoys spending time with people and carries himself with a sweet, steady presence that makes you feel comfortable the moment you meet him.Olaf is the kind of dog who would likely enjoy relaxing by your side, going for nice walks, and being your loyal companion through everyday life. Big in size but even bigger in heart, this lovable guy is ready to find a home where he can share all that gentle affection.If you've been hoping for a big, sweet companion, Olaf may be waiting just for you. 🐶Adoption fee: $300 Primary Color: Grey Weight: 95 Age: 3yrs 8mths 1wks

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Everest

Mastiff

Female, Adult

Santa Rosa, CA

Size

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

Details

Spayed or Neutered,

Story

Meet Everest! Like her namesake, Everest is large (68 lbs.) and majestic, and the beautiful journey to her friendship is an incredibly rewarding endeavor. It takes a little bit of time for Everest to make new friends, but with patience and lots of yummy treats, she blossoms into such a fun-loving and loving dog. If you're looking for a special pup to go on hikes with and to fill your quiet, low-traffic household with warmth, please visit our Santa Rosa location or call 707.542.0882 to chat with our adoptions team! Primary Color: Tan Weight: 31.2 Age: 2yrs 4mths 2wks

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Adam

Mastiff Mixed Breed (Medium)

Male, 2 yrs

Oakland, CA

Size

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

Details

Spayed or Neutered,

Story

Adam is an 80-pound silly, calm and cuddly boy doing so well with his amazing\ foster who says her favorite qualities are his squishy, loveable face, his soft fur, and his smile. Adam walks well on leash and is eager to "sit" for his dinner. He gets along great with other dogs. He is calm, playful and has good manners and is not overly curious about cats. He is low energy but really enjoys going for walks and being let out to run and explore in a fenced area. Adam is protective of his family and property and, with proper introductions, is the most loyal and gentle guy! He needs an adopter who can guide him with boundaries and offer lots of socialization opportunities. Everyone who meets Adam falls in love with him! He's just waiting for the right one who's ready to provide him a stable and loving home. If that's you, please submit an application and a volunteer will be in touch! (HD)

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Breathless Mahoney

Mastiff Mixed Breed (Medium)

Female, 2 yrs 8 mos

Oakland, CA

Size

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

Details

Story

Breathless Mahoney is a gorgeous ~2 year-old mastiff mix. Mahoney currently weighs 90 lbs, but needs to gain some weight and will probably fill in at around 100-120 lbs. Breathless Mahoney is a little shy with new people but once she warms up, she loves to play and snuggle. She is very playful with other dogs and has a puppy-like rough-and-tumble play style. If you're interested in Breathless Mahoney, fill out a questionnaire today!

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PENNY

Mastiff

Female, 2 yrs

Alameda, CA

Size

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

Details

Story

• learning to love affection• playful, great to walk• Independent!Penny arrived to us unsure of the world, but has since decided that after careful consideration, the world is actually pretty great!She is gorgeous, gentle, and sweeter than she probably wants you to know. Once she`s comfortable with you, her whole personality opens up: She is a big trainer, takes fetch extremely seriously, and in what may be the best discovery of her to date: She. LOVES. Water. She`s a big fan of splashing around and throwing her tennis balls in. Penny is ready for a patient, loving home that can keep her playtime up and thriving. If you`re looking for a beautiful pup who is big hearted and can be playful, she`s right here!

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Apollo

Mastiff

Male, Young

Castro Valley, 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 our sweet boy Apollo 🐾 Apollo just turned 2 years old on January 5, 2026. He is a loving, affectionate pup who adores belly rubs and enjoys spending time with his people. Apollo is well-mannered and knows basic commands such as sit, stay, lay down, and shake paws. We are heartbroken to say that we are looking for a new family for Apollo due to circumstances beyond our control—our landlord has required that we rehome him. This decision has not been easy, and our only wish is to find a home that will love and care for him just as much as we do. If you are willing to give Apollo a chance and provide him with a safe, loving forever home, please reach out. He truly deserves a family who will cherish him.

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Mastiff puppies and dogs in Napa, California

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Adopt a Mastiff near you in Napa, 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 Napa, California

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

Search for a Mastiff puppy or dog

Mastiff puppies and dogs in nearby cities

Related breeds in Napa, California

Mastiff shelters & rescues in Napa, California

Looking for a specific shelter or rescue?

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

Mastiff basics

Mastiff basics