This is a team of passionate animal lovers who truly love what we do. We don’t come in to work to earn a paycheck. We come into work to change and save lives. Now, get to know us.


Cassi K. Pettyjohn, B.S., D.V.M.

Veterinarian/Practice Owner

Dr. Cassi Pettyjohn grew up in a small town in Southwest Kansas. She graduated from Kansas State University in 2002 with a bachelor’s degree in animal science and in 2006 with a Doctor of Veterinary Medicine degree from Kansas State University College of Veterinary Medicine.

After graduation, Dr. Pettyjohn pursued a career in equine medicine, which took her to the great states of Iowa, Virginia, and Texas. After moving to the Houston area, Dr. Pettyjohn began to specialize in small animal medicine. Her special interests include dermatology, internal medicine, and dentistry.

She is married with 2 children, two miniature Australian Shepherds (Ankiel and Molina), one cat (Pudge) —all her animals are named after Major League Baseball Players. She enjoys spending time with her family and helping her husband around the farm.

Stephanie Hutchinson


My love and respect for animals grew from my experiences growing up on a family farm right here in Montgomery County. I can’t remember a time that I wasn’t motivated by a desire to help or serve others in some capacity. I enjoy practicing small animal medicine the most, with a focus on applying my medical training to enhance the human animal bond.

I loved College Station so much that I graduated from Texas A&M three times, with undergraduate degrees in Biomedical Science (1990) and Veterinary Science (1995). I earned a teaching certification in Composite Science (1993) and taught Biology and Anatomy & Physiology for several years when my children were small. After graduating from Texas A&M College of Veterinary Medicine in 1997, I spent 10 years practicing in Somerset, New Jersey.

I have three children, the oldest is the Feature Twirler at Southern Methodist University, where she hopes to graduate May 2022 in Civil and Environmental Engineering. My oldest son is training for licensing in Carpentry at Upper Bucks County Vocational School in Pennsylvania. The youngest is in high school at The Woodlands, where he is a Student Athletic Trainer. They make me happy and proud each day.

I currently have three dogs—all Shih-Tzu’s – Jack, Joliet, and Lilly – who became a part of our family Christmas Eve 2009! We also have two young cats that keep us on our toes each and every day! Needless to say, our home is busy and never a dull moment!

“When I look into the eyes of an animal, I do not see an animal. I see a living being. I see a friend. I feel a soul.”

-AD Williams

Care Team

Mandy Spence, B.S.

Practice Manager

Mandy graduated from California State Polytechnic University, Pomona, with a bachelor’s degree in biology in 1994. After graduating from college, she moved back to her childhood home in Willis.

She currently lives in the Woodlands with her husband, daughter, and pets, which include dogs, cats, fish, and snakes.


Veterinary Technician

Kelsey grew up in Willis, Texas where she graduated from Willis High School. She is currently in college studying elementary education. She has been a part of our team since 2013 starting as a volunteer and working her way up to be a Veterinary Technician. She has always had a love for animals as she had been very involved with her local 4-H and FFA groups growing up. She adores her animals at home and will do anything in her power to help your animals here at Stone Ridge.


Veterinary Assistant

Holly was brought up in Palestine Texas. Moved all around Texas, including Abilene, but eventually settled in Willis Texas. Holly recently completed her Bachelors in Animal Science at Sam Houston with a minor in Wildlife Management. She is married with three children who take up all of her extra time. Holly and her family also have a German Shepherd mix rescue named Kiera. She has a passion for animals since she was a little girl. She remembers playing vet with her Beanie Babies. When she was living in Abilene, she volunteered at the Abilene Zoo which ignited her interest in exotic animals, including snakes. From there, she decided to pursue my degree. She loves all animals and is excited to provide love and care for them. If she were to have a side hobby, she would enjoy music and singing. She used to be a part of a praise and worship team at a church in Abilene. She also loves the outdoors whether hiking, fishing, shooting, or horseback riding.


Veterinary Technician/Client Care Specialist

What is your full name and designation?

My name is Maggie Harvey. I am a client care specialist. I have been a veterinary technician for 15 years and fill in from time to time when we need a little extra help.

Where are you originally from?

I am originally from Liberal, Kansas.

How and when did you decide that you wanted to be a veterinary technician?

I began working at a veterinary clinic when I was 15 as I have always had a love for animals. From there I knew this was the career path I wanted to be in and take.

How did you land at Stone Ridge?

I had originally worked with Dr Pettyjohn when she did relief work at another veterinary clinic in Spring and loved working with her. 8 years ago, my husband and I decided to move from Waller to Willis to be closer to his office. I stayed home with our daughter for the first 2 years and decided that I wanted to pick back up in the profession that I love. Luckily, I had known Dr Pettyjohn form the past and she welcomed me into her practice with open arms.

What is your favorite part of being a veterinary technician?

My favorite part of being a veterinary technician is that I have built amazing relationships throughout the past 5 years I have been here with so many wonderful clients and there fur babies. I love being the voice for the pets. Seeing the smiles on there faces make my day.

Tell me about your pets.

Oh boy. Lets go with dogs first. My girls are Aspen who is a 12 year old yellow lab and the absolute love of my life, Dixie is a 5 year old blue pit bull who was a rescue from Stone Ridge, Pearl is a 12 year old blue pitbull and a bouncy ball of energy. Next are my boys. Steel is a 11 year old blue pit bull. You may remember him from the facebook post when we pulled the 8 lb splenic tumor back in December 2019. Cash is a 4 year old blue and white French bulldog who is on the go constantly. Gizmo is my daughter’s squishy 6 year old English Bulldog who she adores. We also have 2 pot belly pigs, Kirby and Lucy who run the property. Our Bearded Dragon Larry loves to catch some sun rays outside with his buddy Squirt the Sulcata Tortoise. Lastly we have 4 cats, Whiskey, Marshmallow, Callie and Whiskers who love to taunt the dogs when they can. I basically run a petting zoo at my house.

Tell me about your human family members.

My husband and I have been together for 12 years. We married in December 2011. We had our biggest blessing born in 2012. Our daughter is now entering 3′ grade! Where does time go?!

What’s something about you that might surprise others?

HA! I am a texture weirdo when it comes to food. I cannot fathom the thought of any yogurt, jello, whipped cream (insert barf emoji) GROSS!

What is your favorite food?

My favorite food is……. CEREAL  and panda express.

What is your biggest fear?

My biggest fear is driving over any tall overpasses and them breaking or bridges over water falling into the water with me in the truck and then I drown. So, my husband likes to tease me while we are driving and while we are on the top of the bridge he yells “Maggie! Omg! I feel the bridge cracking! Look how high we are!”

What is your favorite hobby?

I love to decorate!

City Life or Wide Open Spaces?

Wide Open Spaces for sure!

Spa weekend or Camping weekend?

Camping weekend as long as it involves riding the trails in the buggy!

Tell me a few things that are on your bucket list or something you would like to accomplish in the next 5 years.

My bucket list includes reaching an “expert” level in my field, make someone laugh or smile each day, traveling to Switzerland and taking a journey to see the northern lights.

Any unexpected talents?

Nope! What ya see is what ya get


Licensed Veterinary Technician

Born and raised in The Woodlands, Texas; I am a licensed veterinary technician. I graduated from LSC-Tomball with an Associates in Applied Science and a Veterinary Technology degree in 2011. I then got my Bachelors in Wildlife and Fisheries with an emphasis in Vertebrate Zoology from Texas A & M University in 2014. I love working with most exotics but birds are my ultimate favorite! My passion in veterinary medicine is dentistry as well as client education; but all aspects of this field are fascinating and intriguing. I have two dogs, Wrangler and Cinch; three cats named Quill, Groot and Dory; and one horse named Red.


Veterinary Technician

My name is Christy DuVall and I have been married for over 24 years to my husband, Jason. We have a daughter, Taylor and her husband Ryan who live in north Fort Worth. We are empty nesters who have a Boston named Durham, two cats Stitch and Creed, and a few fish pets. I have been a Veterinary Technician since 1999.

Brenda, B.F.A.

Client Care Specialist

Brenda was born and raised in a small Texas town. She attended Sam Houston State University where she earned a degree in Mass Communication. Brenda is excited to pursue a profession that combines her love for animals and hospitality.

She enjoys cooking and baking, tackling Pinterest projects, and celebrating holiday eves. She currently resides in Huntsville where her cats, Daisy & Duke, run the household.


Veterinary Assistant

Paige was born in The Woodlands but raised in Willis, Texas. She is currently attending school at Lone Star Community College. She has always had a special place in her heart for animals since she was a toddler. She owns two dogs and three horses that she loves very much. In her free time she’s usually in the arena with her horses or out on Lake Conroe.



Veterinary Assistant

I grew up in Spring, Texas for most of my life and slowly made my way up to the Huntsville area. I am currently a student at Sam Houston State University aiming for a bachelors degree in Animal Sciences and a minor in Equine Sciences. I have always enjoyed being in the presence of animals and strive to be apart of the change to make veterinary medicine better each and every day.


Goodwill Ambassador

Push is our resident cat. He came to us as an orphaned kitten in 2013. One of our clients found him on a golf course with a seemingly broken leg. During his exam, he persistently “pushed” the technicians’ hands for optimum pets and scratches, earning him his name.

Push’s road to recovery started off bumpy with the possibly of a leg amputation in his future. The technicians and veterinarians nursed Push back to health, and his broken leg healed on its own- perks of being a strong, feisty kitten!

If he’s not napping in his cat tower, Push loves begging for dog jerky treats, greets clients and patients, and loves to investigate carriers as well as oversized handbags.