Police are investigating an incident that led to a pit bull puppy named Trooper being dragged more than a mile along a highway in Missouri.

The male gold-colored pitbull puppy survived and is currently in recovery after emergency surgeries were performed to save the five-month-old's life, Fox News reported.

"Trooper had surgery last week, and we are optimistic about saving his leg," an update from Monday on the Humane Society of Missouri's Facebook page read. "He has been eating and drinking well and walking around a little each day. He still has at least 6-8 weeks of recovery time ahead of him, but we are just amazed at his will to fight and survive."

Police said the pup was tied to the back of a truck and dragged along a Missouri interstate for 1.6 miles, The New York Daily News reported.

"It’s shocking when an animal is abused to this extent," Missouri Humane Society spokeswoman Jean Jay told Fox. "We are following up on some leads and tips we've received in cooperation with law enforcement."  

"The dog is well for what he's been through," she said. "He is remarkably calm and friendly."

The incident occurred on Nov. 21 when police received a call about a severely injured pitbull after it was dragged from the back of a truck along Highway 55.

Police who were on the scene said the driver was "very distraught" and had no clue how the pitbull became tied to his truck before he called 911. The driver also said he was unaware the animal was being dragged until another driver signaled him to pull over. Police believe the pitbull was tied to the truck and an attached trailer before getting on the road while parked in a St. Louis residential area.

The puppy did not suffer any internal injuries, the Humane Society said. Trooper did, though, lose a lot of blood, injured all four legs, scratched his face and groin and suffered from burns and shock.

“I get chills just sitting here talking about it,” Debbie Hill, vice president of operations at the Humane Society of Missouri, told The Daily News. “These are some of the worst injuries I’ve ever seen happen to an animal. And he survived.”

"There is a chance now we'll be able to save his front right leg," Jay said. "None have been amputated at this point."

The Missouri Humane Society is offering a $5,000 reward for information involved the pitbull puppy being dragged.