(Portland, OR)  --  Wildlife officials are urging caution to pet owners after a coyote snatched and killed two chihuahuas at a Lake Oswego home.  KATU reports the dogs were in their home's backyard yesterday morning when the coyote attacked.  The incident was caught on surveillance camera.  Oregon wildlife biologists say coyotes are a part of our natural ecosystem and that it's important to reduce food sources by securing garbage cans and compost and removing any outside pet food.