When Annabelle Camp found a skinny little puppy on the side of an unnamed road in Georgia, she had no idea that her discovery would set off a chain of events resulting in two lives being saved.

Camp brought home the puppy, whom she named Mason, and cared for him. But she knew she couldn’t keep the stray — her grandmother wouldn’t allow it.

“I made an agreement with my grandmother that he would go to The Humane Society as soon as they had a foster open for him,” Camp told The Dodo. “So a week maximum.”

When no fosters were available, Mason was placed in a boarding facility until he was strong enough to search for his forever home. But while there, he fell ill and was hospitalized. When Camp heard, she begged her grandmother to allow the dog back in the house. Camp’s grandmother agreed — but wasn’t happy about it.

“I was hysterical,” Camp said. “I had to get my baby back.”

Under Camp’s care, Mason healed and soon thrived. But Camp couldn’t shake the feeling that all this had happened for a reason — and she was right.

“I knew he had a purpose on this earth other than to just be my heart dog and a literal pain in the ass,” Camp wrote in a Facebook post. “And last night he proved it.”

Last Monday night, Camp awoke to Mason standing over her in bed and barking in her face. “I shot up out of bed and knew something wasn’t right,” Camp wrote. “He loves his sleep.”

“Mason jumped down and gave me the ‘follow me’ look,” she continued. “He ran down the hallway (where he knows he’s not allowed) and into my grandmother’s room. I followed him into her bathroom and found him standing over her licking her face and just screaming and whining.”

Camp’s grandmother was unconscious due to her heart condition.

Thanks to Mason’s actions, Camp was able to get her grandmother’s heart started — and avoid the worst.

Even though Mason wasn’t allowed to interact with Camp’s grandmother before, there was never a question that he would be there in her time of need. “He knows what it’s like to have his life saved, so he knew he had to do the same for someone else,” Camp said. “Even if my grandmother does just barely tolerate him.”

So has Mason’s heroic gesture won over Camp’s grandmother?

Well, sort of.

“I told my grandmother the next morning what he did and she yelled, ‘Thank you, Mason!’” Camp said. “She now pets him when she sees him, which is more than she has ever done.”

“She loves him in her own way,” she added.