The University of Calgary veterinary school has diagnosed a fatal case of H1N1 in a domestic cat.
The cat was one of two that died in a Calgary household.
These are believed to be the first feline cases of pH1N1-09 in Canada, the university said in a release.
The flu strain has been reported sporadically in cats, ferrets and dogs in other countries.
It's assumed the route of transmission was from humans to cat.
There are no known reports of cat-to-human transmission, but that risk cannot be excluded by veterinarians, the university said.