Image copyright Cynthia Bennett Image caption Baloo (top) and Henry's close bond has won them almost half a million followers on Instagram

Best friends Henry and Baloo have a lot in common - they have both been rescued and now enjoy long walks in the great outdoors. What makes them special to their many fans is that they are a dog and cat travelling duo.

Their unlikely friendship and hiking trips around the beautiful mountainous landscapes of Colorado have gained the pair a cult social media following.

Hundreds of thousands of people follow their adventures on the photo-sharing platform Instagram.

For owners Cynthia Bennett and Andre Sibilsky, their popularity is surreal.

Image copyright Cynthia Bennett Image caption Baloo is known for his unusual sleeping position - on top of Henry's head

Cynthia and Andre met in Boston, but as New Hampshire and Texas natives, the couple say they are both nature lovers who were destined to move away from city life.

"We wanted to head west, toward bigger mountains. We came upon Colorado and moved on a whim, there wasn't a lot of planning involved," Cynthia told the BBC.

The pair started hiking regularly and once settled, decided to extend their family by adopting a dog.

Henry - a tall and lanky German Shepherd, Husky, Boxer, Staffordshire Terrier and Aussie mix - stood out right away.

Image copyright Cynthia Bennett Image caption The animals' popularity has allowed the couple to pursue their love of the outdoors

"He was the same age as all the other puppies but twice the size. As soon as I got into the pen to see him, he crawled onto my lap and went belly up," Cynthia explains, laughing.

"Andre knew then we were taking him home. I feel like he chose us in a way."

Born as a street puppy, Henry was adopted from a rescue centre that re-homes animals from other states whose shelters have high abandonment and kill rates.

A mix of high energy dogs, he took to hiking and long walks straight away.

A year later, Cynthia realised that she was posting too many pictures of Henry on her social media accounts, and decided it would be a fun idea to give him one of his own.

Image copyright Cynthia Bennett Image caption Henry has joined his owners on their nature walks since they adopted him as a puppy

It took three years to get 30,000 followers on the account. That number spiralled out of control when they got Baloo.

"Henry had really bad separation anxiety when we weren't home. He would be so stressed out that he didn't eat or drink, so we decided we really wanted a buddy for him," Cynthia says.

"I love to take my animals everywhere - and because of Instagram I had seen other people hiking with cats, who really loved being outside," she adds.

The couple spent months looking for the right match for their unique situation.

"After all" Cynthia laughed, "You can't really force a cat to do anything."

An unlikely bond

Like Henry, Baloo was a rescue animal. He was part of a litter of eight kittens belonging to a mother whose owner refused to have neutered. He and his siblings were abandoned immediately.

"As soon as he met Henry he attached himself right away. Baloo definitely has an obsession with Henry - if I need him to calm down, I'll put him next to him and he'll just fall asleep.

Image copyright Cynthia Bennett Image caption The two rescue pets have become Instagram sensations because of their unusual bond

Image copyright Cynthia Bennett Image caption The pair have proven perfect models for Cynthia's love of photography

"I truly believe he [Baloo] thinks Henry is his Mom," she says. "For the first few months he would actually knead him looking to nurse."

Cynthia believes the Siamese mix thinks he's a dog, too.

"If he sees a dog out on a walk he'll run up to it, but if he sees a cat he will pretend it isn't there and ignore it. Like, do you not understand what you are? It's quite funny."

Photographs and videos of the cat and dog together, with Baloo riding or running alongside on a leash, have exploded in popularity on social media.

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Cynthia's family, she says, are dumbfounded by their popularity.

"I told my grandfather, who is my best friend. He's very outdoorsy and natural so we've always been really close. He thinks it's mind-blowing."

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Andre works a typical office job in finance, but the popularity of the Instagram account has led Cynthia to scale back on her work in event marketing and focus more on updating the account and her passion for photography.

The animals' popularity has led to endorsement deals, such as those popular with other online celebrity animals like Grumpy cat.

"Taking a leap as an artist is very scary and it's not very stable in the long side of things, but I tell my followers all the time you are changing my life and allowing me to do what I love," Cynthia says.

Image copyright Cynthia Bennett Image caption Cynthia points out to followers that Baloo is not strapped in any way to Henry

Image copyright Cynthia Bennett Image caption The animals behave like family members and best friends

"It's also giving Henry and Baloo a better life, I get more time off to travel and be with them."

It is not all positive, however. Popularity has brought on some backlash against the couple's alternative outdoor-based lifestyle, according to Cynthia.

"As soon as you get well known, you get the other side - which has been different to deal with.

"I'm like, why are you attacking a dog and a cat? I just don't get it."

Image copyright Cynthia Bennett Image caption Baloo, who wears a harness on walks, is said to love exploring as much as Henry

But she says the support far outweighs the negativity.

Through the social platform they have been able to connect with others, such as people in the so-called "vanlife" community, who receive similar complaints and criticism over their nomadic lifestyles.

"You just have to ignore it and let it wash over you. You just read the hundreds of other comments that say Henry and Baloo brighten up their day."