Even though their backyard was fenced it, it wasn't enough to keep out coyotes in Deerfield and kill one of the family's pit bulls. It's coyote breeding season right now and if pups are involved, they can be more aggressive. Authorities recommend not leaving pet food outside and making sure unwanted brush is cut back. What do you do if you spot a coyote out on a walk? You want to scare it and keep your dog close. Here are a few ideas.