Responses
Simplest answer is one is where you have sex with a creature that cannot give its consent (beastiality) . And the other, is where the person/creature has the ability to verbally give consent (furry). So... have sex with a sheep, that would be beastialty. Have sex with a werewolf or a person dressed like one, would be considered furry.
Honestly, this is no different from furries. And I personally think furries are a big big no-no....
But 'this'...