recently i took farkas as my companion for my female imperial, when i have her transform into her werewolf form farkas attacks her even though he used to be a werewolf and he is fully aware that my female imperial is a werewolf (has anyone else who has farkas as a companion and is a werewolf had that happen to them or is it a bug)??

If he is cured, I think his morality / disposition is reset. That basically makes him a goodie-goodie and will attack the player when transformed.

Farkas is not the sharpest knife in the drawer, bless him!

There have been posts about player-character werewolves being attacked by Farkas, Vilkas and Aela dating back to november 2011.

Because you are a pain at the rear end.

You will always be attacked by anyone/everyone who witnesses you transform...

I thought this was well known?

Go off somewhere private to transform.