Fort Lauderdale, Florida - Most dogs spend only a few weeks at the Humane Society's shelter in Boward County, Florida. But not poor Carlie, who had already spent six months hoping for a new forever home when her carers came up with an ingenious campaign.

No one seemed to want Carlie, but that's because she was basically invisible.

She would hide in the corner of her kennel whenever people came to look for a new pet.

"Carlie did not do well in the shelter environment, and she became increasingly shy and withdrawn," Susan Leonti, digital marketing specialist at the Humane Society of Broward County, told The Dodo. "Her fearfulness caused her to hide at the back of her kennel, where she was not visible to people walking by. She was so well hidden that she became known as the invisible dog."

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Shelter workers were set on doing their bit to help Carlie. They hand-fed her and introduced her to other dogs.

"Carlie began to associate people with things that she enjoys, like getting treats and receiving affection," Susan said, "She began spending more time at the front of her kennel instead of hiding."

Even though the poor pooch was no longer "invisible," she was still getting passed over. That's when her carers decided to put a heartwarming note on her cage and make a video that changed everything.

The note on this shy dog's cage said, "I have been here longer than any other dog. You wouldn't know that because I've been hiding in the back corner of my cage."

The shelter workers shared Carlie's story on social media.

"The video of Carlie and her sign are what helped Carlie get adopted," Susan shared happily. "Her new mom saw her heartbreaking video on Facebook and knew she was meant to be Carlie’s forever family."

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Carlie's new family drove over two hours to adopt her.

She's anything but invisible now!