Relatives of an 82-year-old Alzheimer’s patient were under the impression that only one beloved pet cat had to be looked after when the home was vacated, but a trip to check on the animal gave them quite a shock.

“Out from under a bed it darted,” Paul Russell, the patient’s relative, told PEOPLE. “At first I thought it was a cat that had a blanket on top of it. The next day I went into the creepy old cellar and it was hunkered in a corner. I thought, ‘My God, this is a cat.’”

What the Churchill, Pennsylvania, man had found was a 14-year-old cat, now called ‘Hidey,’ that had grown too obese to groom itself. The result was years’ worth of matted fur that disguised the cat’s identity.

Russell took Hidey and the cat he had known about previously, Siam, home to his wife Jill and they made an appointment with the Animal Rescue League Shelter & Wildlife Center. The center shaved off Hidey’s matted fur and said the animal is an example of what can happen when pets of elderly relatives aren’t checked on frequently.

“The companionship of a pet can bring many positive benefits to the elderly, however, owning a pet is a large responsibility,” Dan Rossi, CEO of the Animal Rescue League Shelter in the Western PA Humane Society, told PEOPLE. “If a family member, friend or neighbor owns a pet, please help them to make sure there is a support system in place if/when mental faculties begin diminishing. Also, open door shelters such as Animal Rescue League Shelter and Western PA Humane Society do not turn any animal away if there are no other options for the pet.”

Siam and Hidey are returning home to the Russells where they join three other cats and two dogs. Russell told PEOPLE that Hidey is adjusting to living without pounds of extra matted fur.

“For the first couple of days she hid under the bed,” he told PEOPLE. “When you hold her, she’s clearly shivering and nervous. She’s just starting to come out on her own now.”