while walking home with my dog from the ford test track in between Central and Westcott on Alice, I was passed by a man and his dog in a white newer model Chevy Crew cab full size truck. His back window was down too far and the dog jumped out a few seconds after seeing my dog . I screamed STOP at the top of my lungs. after dragging the dog 5 feet HANGING by his neck and leash completely out of the truck he stopped. Then it took him about 10 seconds too get him free. Quickly after that he struck the dog in the face twice and said "bad dog" "are you Fu@$#%ing stupid". I started running towards his truck to get a picture but he took off in a hurry.Two people who were standing maybe 10 feet away DID NOTHING!!!!. I HAVE SEEN THIS MAN AND HIS DOG BEFORE HE LIVES AROUND SEMINOLE AND PILETTE AREA and the dog is a BRINDLE BOXER...YOU BEEN SPOTTED JERK!!!