Cats were traditionally used as mousers (as Larry the cat as the UK's Chief Mouser performs to this day at 10 Downing Street), but rats traditionally were handl

Cats were traditionally used as mousers (as Larry the cat as the UK's Chief Mouser performs to this day at 10 Downing Street), but rats traditionally were handled by dogs, particularly terriers, who were bred originally to hunt rats and other vermin.