A Lyme disease-carrying tick was found on a dog in Fort Simpson, N.W.T., with uncertainty about whether the tick originated locally or from a southern province.

A dog at the Kodiak Animal Shelter was euthanized after testing positive for canine distemper, leading to a quarantine and a halt on adoptions.

Avian influenza or “bird flu” is hitting Bay Area poultry farms hard, with a quarter of a million birds euthanized in Sonoma County this week alone. Mike Weber, the co-owner of Sunrise Farms in Petaluma, says around 82,000 of his egg-laying chickens had to be euthanized after birds started testing positive for avian flu.