Are You Ready To ADOPT?

Open Door Animal Sanctuary has the largest selection of adoptable cats and dogs in the St. Louis Metro area. Whether you are looking for your first family pet or adding to your existing family, the staff at Open Door can help you find that special someone who is right for your home. The members of our cat-care and dog-care teams are experienced in matching up the right pet with the right situation and making sure your new family member is properly introduced to your current ones.
  • Healthy Pets & Support

    All our animals receive full medical and behavioral evaluations, preventative care & vaccinations. We also help you and your pet adjust to their new home.
  • Our Requirements

    Complete our adoption questionnaire. Our goal is to find permanent, loving homes!
  • Fall In Love!

    Come meet our furry friends & then we will schedule a visit to your home before finalizing the adoption.
  • Adoption Fees

    Cats $75 / Dogs, Puppies & Kittens $150 covers spay/neuter, vaccinations, microchip, heartworm & flea/tick preventative.
  • Take Your New Family Member Home

    Adoptions include medical records, chip registration, food & goodies, collar & tags.
  • Kisses & Return Policy

    Give your new family member 100 kisses every day! Our Lifetime Return Policy means if you can no longer care for your pet they must be returned to us.


Open Door Animal Sanctuary is the area’s largest no-kill shelter. We have nearly 350 cats and dogs available for adoption at our Sanctuary in House Springs and have around a dozen cats year round at the Chesterfield Petsmart adoption center. Our cats and dogs are featured on our on-line listing of pets. Due to time constraints, some cats and dogs may not be shown. If you have a particular type of pet in mind, please give us a call at (636) 671-3643.

We have our adoptables listed on both and To search just our DOGS or just our CATS, please use the links below.

Reasons to Adopt an Adult Cat or Dog

No matter what kind of cat or dog you want to adopt, you should consider an older pet. Older pets will bring with them the same companionship and love you want, while needing less time or training than their younger counterparts. Before you take home a brand-new kitten or puppy, consider these top five reasons to adopt an older pet.

For the convenience of potential adopters, we schedule adoption appointments, seven days a week – 365 Days a Year!

7 days a week: 10:00 am – 4:00 pm
Holiday Hours: 10:00 am – 2:00 pm

We also have adoptable cats year round at the Chesterfield Petsmart Adoption Center and typically bring adoptable dogs there several Saturdays a month as well!  Search for Open Door Animal Sanctuary Kitties on Facebook to see the cats available at Chesterfield Petsmart!

No Surprises

If you have a specific size or temperament in mind for your pet, then you can easily determine which older animal is best for you. With younger pets, many factors are still determining their size and personality; but older pets are fully grown, and their personalities fully formed. Spending some time with the animal before the adoption will give you a clearer picture on what to expect for each individual pet.

No Stress & No Mess

Older pets have already been socialized and trained. Older cats and dogs will be litter-box trained or house broken. For you, this means the hardest part of getting a new pet is already taken care of, and your new pet will need less training and less supervision than a puppy or kitten. If you are a first-time pet owner or just don’t have the time to constantly clean up after your pet, then an older pet could be a perfect fit.

Old Dogs & New Tricks

Not every older dog or cat will be perfect, but don’t worry. Even the oldest animal can be retrained or rehabilitated. Every home or individual will require different things of their pet. With time, patience, and proper training, your older pet can continue to learn new tricks and commands.

Great Companions

Your adult pet can provide great companionship. Many older animals will have low energy levels and be easy going. No matter your schedule, an older pet will be content to sleep away the day or cuddle up next you on the couch. Many older pets will also enjoy playing or exercising for short periods of time.

Save A Life!

Older pets need someone who cares. It is an unfortunate reality that older animals are the last to be chosen for a new home. When you adopt an older pet, you are giving them a new lease on life.