| Last updated
You can watch the heart-wrenching footage here:
Fostered pup Boomer was one of four dogs in a stray pack living outside a bank - frequently used as "target practice".
The two-year-old terrier-mix was taken in by rescue centre worker Samantha Zimmer, 35, who initially housed him in her garage to help him get used to home life.
But Boomer - who had a broken femur and a pellet lodged in his ribs - had never been indoors before, so initially struggled to come into their home.
The heart breaking video shows the pooch apparently confused by the door and house, pawing at the doorway into the house.
After weeks of patience by Samantha and her family, the dog is now growing in confidence, and will soon be able to be adopted by his forever family.
Samantha, from Houston, Texas, said: "I was leaving to go work. My boyfriend was home so Boomer was outside in the front enjoying the morning.
"I was curious if he would come inside and wanted to film it. Sadly he was unsure and it just broke my heart to see him hesitate."
Samantha - foster coordinator at rescue centre Lola's Lucky Day - discovered Boomer after she was sent a video of a pack of four stray dogs outside a bank.
She said: "The area of town in Houston is notorious for stray dogs.
"Before the freeze I had space in my garage to take in all four dogs she showed me, so we picked up two one day and had to come back the next day to trap Boomer.
"He was too shy to come up to us.
"Neighbours in the area love to use dogs as target practice, or they shoot at them for getting into the trash."
Samantha fostered him on 14th February and kept him in their garage for the first two weeks.
Along with her boyfriend, she would bring him in by carrying him but wanted to see if the two-year-old terrier-mix was comfortable doing it by himself, when she filmed him.
The pooch is now comfortable running in and out, and will be moving to a new foster centre in Wisconsin in three months time to prepare him for adoption.
Boomer loves nothing more than a long walk in the park and a belly rub, but is nervous of larger dogs as he used to be attacked on the streets.
Boomer will be moving to a new foster centre in Wisconsin in three months time to prepare him for adoption into his forever home.
Samantha said: "Boomer is one of thousands of stray dogs. Because of his size and breed he would have had a hard time finding a foster home.
"He was too scared to come to us, but with love and patience he has won the hearts of millions of people.
"What's incredible to me is that Boomer spent his life invisible to all the humans he encountered.
"A few people fed him, but for the most part people aren't surprised to see a stray dog. They throw some food down and go about their days.
"And now with the help of TikTok this once ignored dog has captured the hearts of so many people.
"He gives hope to the other dogs patiently waiting for someone to take a chance on them and foster them.
"Anyone can help a stray dog. It's an incredibly rewarding experience."
Chosen for YouChosen for You
Most Read StoriesMost Read