Canadians have been lining up across the country to get an H1N1 flu shot, but it may not be just themselves and their family members they have to worry about when it comes to contracting the virus.

Some pets may also be susceptible to the disease.

On Wednesday, U.S. officials confirmed that a 13-year-old cat was infected with swine flu. The domestic shorthair was treated last week at Iowa State University College of Veterinary Medicine and has recovered.

“We've known certainly it's possible this could happen,” said Tom Skinner, a spokesman for the U.S Centers for Disease Control. “This may be the first instance where we have documentation that transmission occurred involving cats or dogs.”

Swine flu was also confirmed in two pet ferrets in Oregon and Nebraska. Stormy, one of four pet ferrets owned by a Nebraska family, died last week after all the animals contracted H1N1 influenza from their owners.