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Meet Our Reliable, Caring & Trustworthy Team!

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Gabrielle Walker-
Founder - Pack Leader - Pet Sitter 

Gabrielle Walker (real last name) founder of Fit Dog Theory, is a professional dog walker, certified in canine behavior, pack management, safety and fight protocols, as well as pet CPR and first aid. Gabrielle is a team player who is dedicated to providing her clients the services and tools they need to provide an abundant life for her client's pets. She is patient and respectful with each animal in her care and treats them as if they were her own.

"I am a Bay Area native and enjoy hiking, running, swimming, gardening, and spending time with my toddler. I am so grateful to have had the opportunity to work with so many amazing dogs in the past seven years! It has been highly rewarding helping dogs build thier confidence. 

Professional Certifications

  • Graduate of Pawsitive Tails- Dog Walking Academy.

  • Insured and bonded with Pet Sitters Associates.

  • First Aid and CPR certified by Pet Tech.

  • Fit Dog Theory is licensed with the city of Walnut Creek.

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Nina Lopez-
Dog Walker - Pack Leader 

Nina grew up on a farm and had many dogs and animals she cared for. She has an extensive knowledge about dogs, other animals and other critters. On days Nina is not with our team she is caring for dogs at a dog daycare facility in the bay area. Nina takes on new challenges with eagerness and confidence to succeed. 


“I spent time growing up on ranches in break from school running around with tons of dogs! I always look forward to pet sitting relative’s pups and giving them a few special days with treats and adventures. I love hiking and swimming in rivers and lakes! l am learning more about the pet service industry and can only hope to grow and learn more techniques to create a fun environment for the pups in my care. I am eager to learn about each dog’s personality and learn what they like to make their pack walks enjoyable. I look forward to spending quality time with the pack and creating a bond that will make our walks fun and exciting!” -Nina

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