Dear Keiva: Here is a quote about rogue Border Collies, which of course does not apply to Flirt.

Border Collie site http://www.bcrescue.org/bcwarning.html

Rogue dogs however, are not uncommon, and in many European countries,
Australia and New Zealand, where the dogs are often allowed to roam free, sheep
and calf-killing Border Collies can pose occassional threats to livestock. Many
people say that once a Border Collie has tasted blood, they can never be trusted
again and normally, the dogs are summarily exterminated.