Sark: 99 Problems, But A Bitch Ain't One?

First, and I assure you, last, time I use Jay-Z in an OP title.

Reading Mervyn Peake’s “Mr. Pym,” wherein he relates, of the Channel Island of Sark (setting for his story), that the male dogs are very morose, because by law, no bitches are allowed on the island.

Really? Why?

The book was published ca. 1953. True then?

True now?

Not quite. (Not quite in 1953 either).

Sark.gov