Fleck is a Bretonnian Mastiff, a large and aggressive type of dog bred for war and hunting large game. He was the guard dog at Wernicke's Farm and took a shine to Thrumir Bhakdram following the death of Emmerick Wernickeat the battle where he was badly injured.
It was thought he hadn't survived the battle of Frugelhofen, however he found his way to La Maisontaal and is currently accompanying Thrumir Bhakdram
Fleck is dangerous in a fight, very quickly killing 2 Skaven in the fight at the cavern in the Barren Hills, as well as some of the guards from Castle Wittgenstein