I adopted my dog from the SPCA in the summer of 1999. At that time, I was told she was about 3 months old and was a sheltie/rat terrier mix. I've never thought she was what they told me, but it wasn't until recently that I started to do research on coyotes breeding with domestic dogs. She is now approximately 12 years old and weighs about 38 pounds (more or less). She will never touch a toy. She's only concerned about food. Over the years, she has killed numerous mice, squirrels, and birds. She howls nonstop. She's very submissive to me and doesn't show much affection to many other people. Also, I live in an area where coyotes are very common. If anyone has an idea of what she might be, I'd greatly appreciate the insight. I'm attaching a picture of her when I first got her as well as recent ones.