Can you link me to a great outdoor hidden security camera?

[macquaid35]

We live out in the country and we have dogs to protect our property. But our dogs keep mysteriously disappearing and the other night somebody shot our dog right at the end of our driveway. I realize there's nothing legally we can do about the fact our dog was shot but it was reckless discharge of firearms and I want to be able to have evidence against the little f*ckers if they do that again.

Specifications:
-weather proof
-small, able to be hidden in a tree or something (I want to put it at the end of our driveway)
-Anything else you might think good in a security camera.