3(1)At the end of subsection (2) of section 1 of the [1953 c. 28.] Dogs (Protection of Livestock) Act 1953 (penalty where dog worries livestock on agricultural land) there shall be inserted the words “or
(c)being at large (that is to say not on a lead or otherwise under close control) in a field or enclosure in which there are sheep ".”.
(2)After that subsection there shall be inserted the following subsection—
“(2A)Subsection (2)(c) of this section shall not apply in relation to—
(a)a dog owned by, or in the charge of, the occupier of the field or enclosure or the owner of the sheep or a person authorised by either of those persons ; or
(b)a police dog, a guide dog, a trained sheep dog, a working gun dog or a pack of hounds.”