In terms of appearance, wolves in Minecraft were originally gray in color. Once tamed, they would become loyal companions that would follow the player, defend them from hostile mobs, and even help them hunt. However, in a later update, they were changed to become tameable by feeding them bones. Initially, wolves in Minecraft were hostile creatures that would attack players on sight.
They were added in the Beta 1.4 update in 2011, along with other mobs such as sheep and spiders. Minecraft dogs, also known as wolves, have been a part of the game since its early days.