Los Angeles, Feb 16 (IANS): Actor Charlie Sheen has donated $10,000 to an injured teenager to help her pay for a therapy dog.

Sheen was moved by the plight of 15-year-old Teagan Marti, who suffered brain, spine, pelvis and internal injuries in July 2010, when she fell 100 feet from a Wisconsin amusement park ride.

The actor has chipped in to pay for the dog, who will turn on lights, pick up objects and be her constant companion, reports contactmusic.com

After a friend of the family contacted Sheen through his godfather, the actor said: "I like to pay it forward. People come into your orbit for a reason. You don't always know what that is ahead of time, but if I ignore these requests, then I don't have any opportunity to see where these things lead us, or lead me."

Teagan's mother Julie praised the actor for his generosity and revealed she broke down in tears when she heard about the donation.

"I'm in such disbelief. I was crying. ... What a guy. What a guy," she said.