I was In my kitchen a few months back and saw a young bloke in my garden, I ran out the door and tried to run down the side of the garden so I could get close to him without being seen so I could catch him and find out exactly what he was up to. Got to about 20yds and he looked straight at me I was fuming at this point and shouted COME HERE YOU CNUT, he took off at speed so I never did find out what he was doing. Its likely he was just trying to cut through the garden but who knows.
Stealing animals it doesn't get much lower than that hope you get them back.