Our dog walkers are the best in Oakland, Piedmont, and Berkeley

Glenn Millstone Owner and Director

Glenn was raised in a house full of dogs in Michigan, and dogs have played a huge part in his life ever since. After graduating from Michigan State University, he relocated to California where he lived in Oakland for twenty years. After gaining tremendous experience, he took the final steps of creating a business of his own that met his personal expectations of dog care and quality.  In Their Element has been in business of providing fun outings for dogs for over fourteen years now.

Glenn is married and lives in Orinda with his wife, two children, and their dog Rosie.  Rosie loves to come on the trail hikes whenever a spot is available. 

The main thing that sets 'In Their Element' apart from other dog walking services is the level of devotion to you and your dog, and our commitment to ensuring that you're both getting the best possible experience. Our goal is to make a positive difference in your life and the life of your dog.  The golden triangle and overall focus of our company is quality outings, reliability/dependability, and the safety of your dog.

Glenn is trained and experienced in pack management, canine body language and psychology, and has over 6,000 trail hours of Group Leader experience.  

Marisa Piovarcsik, Walker, Pack Leader smiling on a path Kellen was born in Salinas, CA and grew up in Santa Cruz.  He studied Health Sciences at CSU East Bay and is extremely passionate about public and individual health. As an adult, he's been fortunate enough to live in different regions around the Bay Area, but loves the diversity in ecology and cultural surroundings of the East Bay the most. 


Kellen enjoys spending as much time as he can adventuring in nature with his 6 year old Australian Shepherd Samson. Whether it's rock climbing, trail running, or hiking, they love to explore the many beautiful places around our great state.  His passion for being outside, exercising, exploring, and being with dogs, make this a dream job for Kellen.  He’s excited to share this passion with many more dogs, and be a pack leader. Samson is excited too!  You can check out more of his adventures on his instagram profile @lennycorreal.

Marisa Piovarcsik, Walker, Pack Leader smiling on a path Surrounded by rescue dogs since birth, Becky brings a passion for all things Dog as the newest addition to In Their Element.  Becky is a former gymnast, current nationally ranked mountain bike racer, high school coach, swimmer, runner, and hiker.  Prior to the pandemic, she had her own dog walking business, and is overjoyed to be back in the hills with dogs. She volunteers with Hopalong Animal Rescue, Contra Costa County Animal Shelter Running Dog program, and is known to randomly burst into song while hiking.  She is an advocate for rescue, fostering, and dog safety, and tells the kids she coaches and the dogs she walks that 'all the miles are good miles'.

Staff Walker CC kneeling on a path holding a pupCC Sheldon grew up in Truckee, California, on the north side of Lake Tahoe and nestled in the Sierra Nevada mountains.  She is a proud graduate of Truckee High, and a truly adventurous soul with a real passion for life.  By day you’ll usually find her exploring the trails with her best buddy Gus, a six year old Shih Tzu that is an off-leash hiking guru. And by night, you may find her on a San Francisco stage, performing whatever play or musical she’s in at the time.  

CC is an actress, dancer, and vocalist, and graduated from the Pacific Conservatory for the Performing Arts.  And during her time off, she’s also an avid traveler and adventurer, having hiked up to 18,000 feet just above Everest Base Camp, as well as back-packing through the Mongolian wilderness, and many other incredible places around the world.  CC has done an incredible job and been with the company for four years now, specializing in leading groups of mostly small to medium dogs.