Okay, so an update on my dog.
Last night I took Tux out the back and we did a lovely sneak up on some bunnies up the back. He spotted them and took off. Sadly they had too many places to go to get away from him, but he did come back with the tail off one. I let him have it as his reward. Hopefully when the time comes, he'll show the same amount of enthusiasm!
Will keep you updated!