Yes. A dog is regarded in law as a "normal accompaniment" (like a camera). The law does not actually specify whether it should be on a lead, or not, but merely that it should be under control. If you are near livestock, you should always keep it on the lead. If a landowner sees your dog worrying livestock, or if he thinks it may be about to, he is legally entitled to shoot it.
Westerham Ramblers
Give my people plenty of beer, good beer, and cheap beer, and you will have no revolution among them.
Queen Victoria
