Senior confirmed
Blueberry Pancake
The Halfway House- Ann Arbor Location • Ann Arbor, MI
Senior Mastiff dogs
Senior Mastiff dogs for adoption
Meet 29 adoptable senior Mastiff dogs (age 7+) from shelters and rescues across the country. Older dogs are often calm, house-trained, and ready to love from day one.
Senior Mastiffs are often overlooked in favor of puppies, yet they're frequently house-trained, settled in temperament, and ready to bond immediately. Because they're fully grown, you already know roughly how big they are and what they're like — making an older Mastiff one of the most predictable and rewarding dogs you can welcome home.
Last updated August 21, 2026 at 12:26 AM EDT. Listings refresh automatically, usually every 12 hours.
Available senior Mastiff dogs
Senior confirmed
Senior confirmed
Senior confirmed
Senior confirmed
JUNO
Hi, I'm Juno! I'm a sweet girl with a big heart to match my big paws. Everyone says I'm incredibly sweet, and my favorite thing is spending time with …
Larimer Humane Society • Fort Collins, CO
10+ years
NATE
Nate A571588 Meet Nate If you're looking for a gentle soul with a heart as big as his paws, 10-year-old Nate is ready to meet you. This sweet Mastiff …
Prince Georges County Animal Management Division • Forestville, MD
10+ years
Senior confirmed
STITCH
Meet Stitch! Stitch is a 7-year-old, neutered Mastiff mix with a calm, gentle personality and a low-energy lifestyle that's perfect for someone lookin…
Grand Prairie Animal Services • Grand Prairie, TX
Senior confirmed
Senior confirmed
Senior confirmed
Senior confirmed
Urgent Need
GNOCCHI
08/19/26 15:27Gnocchi has been placed on needs rescue URGENT for his consistent high FAS (fear, anxiety, stress) score since begin here at the shelter…
San Jose Animal Care Center • San Jose, CA
10+ years
Pancho
Poor old man was roaming in town from house to house just looking for a kind human to help. Nails were long and curled, double ear infection and sever…
Stover Animal Rescue, Inc. • Stover, MO
Senior confirmed
ROSCOE
Roscoe (A567045) is a 7-year-old senior with the sweetest, most gentle soul. He has a calm, quiet demeanor and seems very well-mannered. As soon as we…
Prince Georges County Animal Management Division • Forestville, MD
Senior confirmed
Sage
Adoptions are generally limited to an approximately 150-mile radius of Locust Grove, Georgia. Exceptions may be considered under certain circumstances…
Street Paws • Locust Grove, GA
Senior confirmed
Bob
Welcome Bob to CCPAL Rescue. He is a 7.5-year-old Mastiff/Lab mixed dog. He is about 50 pounds and he is very sweet. He is now ready for his forever h…
Cowboy Capital Pet Assistance League • Bandera, TX
Senior confirmed
Chulo
Meet Chulo! A spirited almost seven-year-old Labrador Retriever/Mastiff/Black Mouth Cur mix currently in Austin, TX, whose essence is a joyful blend o…
Joyful Pets Animal Rescue • Amherst, MA
10+ years
Piper - For the Love of Mastiffs
Piper is part of our "For the Love of Mastiffs" adoption event and her adoption fee is waived! Meet Piper! Piper ended up in a shelter near St. Louis …
Great Plains Mastiff Rescue Foundation • Edmond, OK
Senior confirmed
Maggie - For the Love of Mastiffs
Maggie is part of our "For the Love of Mastiffs" adoption special and her fee is waived!***Meet Maggie! Maggie is an estimated 7-year-old Mastiff who …
Great Plains Mastiff Rescue Foundation • Edmond, OK
Senior confirmed
Senior confirmed
Franny
Meet Franny! This girl was found as a stray outside a business in Fort Worth in horrible condition. She is severely underweight, has worn and broken t…
Great Plains Mastiff Rescue Foundation • Edmond, OK
Senior confirmed
10+ years
Senior confirmed
Sully
Every morning, Sully clocks in for his favorite job: Neighborhood Watch. From the end of his kennel row, he keeps an eye on everyone who comes around …
Animal Rescue Fund of MS • Jackson, MS
Senior confirmed
Duke (bonded with Christina) (foster needed)
The Big Mutt Network • Vail, AZ
Senior confirmed
Christina (bonded with Duke) (foster needed)
The Big Mutt Network • Vail, AZ
Senior confirmed
Slim
Hi! I'm Slim... and before you ask... yes, I smile this big all the time. Life is just better when you're happy, and I try my best to prove that every…
Animal Rescue Fund of MS • Jackson, MS
Senior confirmed
Senior Mastiff dogs by state
Other breeds
Adopting a senior Mastiff — FAQ
What counts as a senior dog?
Most shelters and vets consider a dog "senior" around age 7, though large breeds often age sooner and small breeds a little later. Every dog listed here is 7 years or older.
How do I adopt a senior Mastiff?
Open a dog's profile to see the shelter or rescue caring for them, then follow the adoption link or contact details to apply directly with that organization.
Are senior Mastiff dogs a good fit for first-time adopters?
Often, yes. An older Mastiff is usually past the high-energy puppy stage and may already know basic commands, which can make ownership easier to ease into. Each profile and shelter can tell you about that dog's individual personality and needs.
Why adopt a senior dog instead of a puppy?
Senior dogs are calmer, usually house-trained, and let you skip the chewing and sleepless nights — and because they are the hardest to place, adopting one can quite literally save a life that might otherwise run out of time.
Are senior Mastiff dogs good with children or other pets?
It depends on the individual dog more than the breed alone. Each dog's profile and the shelter or rescue caring for them can tell you about their history with kids, cats, or other dogs. Senior dogs are often calmer and more predictable than puppies, which can make reading compatibility easier before you commit.
How much does it cost to adopt a senior Mastiff?
Adoption fees vary by shelter and rescue, but senior dogs are frequently discounted or even sponsored — because they wait the longest, many organizations offer reduced fees or cover initial vet care. Open a dog's profile and ask the organization directly for their current fee and what it includes.
Can I foster a senior Mastiff instead of adopting?
Many shelters and rescues offer a foster program, sometimes with a foster-to-adopt path. Fostering a senior Mastiff gets them out of a kennel and into a calm home — which is especially beneficial for older dogs who find shelter life stressful. Ask the organization on any dog's profile whether fostering is an option.
Know a senior dog who needs a home?
Shelters and rescues can list adoptable senior dogs for free.