Yeah.. just enable friendly fire, then shoot them with an arrow, it's a guaranteed one shot instant kill with no mistakes :-)

Kicking them works good also. I forgot I had friendly fire turned on, and accidentally kicked one of my tamed boars. One shot dead, instakill, mistake made.

You're welcome!

Butcher's knife is new with the update.

Need Tin & wood to make Butcher Knife & kill them with that. Otherwise put pvp mode on friendly fire.

Thanks! didn't realise that friendly fire also applied to animals.

https://valheim.fandom.com/wiki/Butcher_knife

Open inventory and click on the swords in the upper right for PvP and use regular weapons, or make a butchers knife using tin.

Use a butchers knife, no bug here.