i know a cheaper way to do Surveillance. Its even cheaper if you have your own webcam. Hook ur webcam up to a window that watches the dog pen. You can get free software on the net that will take photos only when something is moving. I have one, its called "visionGS PE". Set up a light in ur dog pen (don't worry dogs can sleep with a bit of light).

If your comp is far from the window all u have to do is buy a longer cord to extend it. & then ur set just don't tell anyone about the cam, so there is no way in hell she can find out.