A Wonder Lake man suffered 100 puncture wounds, and possibly nerve damage, when he tried to break up a fight between his dog and a dog on the loose.
McHenry County animal control officers are searching for the dog that walked into the victim's garage and attacked his dog but have been unsuccessful locating it.
The dog is described as a brown male pit bull or American bull dog weighing about 100 pounds with a black muzzle and a 6 by 8 inch patch of white on its check, according to the health department.
The homeowner who suffered possible nerve and tendon damage in the attack was standing in front of his home on the 7600 block of Cedar Road on March 11 when the dog entered his garage and attacked his dog.
"The owner stepped in and probably took the brunt of those injuries," said Debra Quackenbush, spokeswoman for the department of health. "He was bit by both dogs."
Animal control authorities ran a check on all animals registered in the county that matched the description of the dog and went door-to-door checking on those dogs.
Quackenbush said none of the registered animals had been in an attack.
"It leads us to suspect that dog was not registered, and the owner could be hiding the dog," she said.
The man who was seriously injured in the attack will likely undergo rabies vaccinations, Quackenbush said.
Animal control officers hope residents in the area might recognize the description of the dog and are asking anyone with information to call (815) 459-6222.