Martens in Dappled Forest

What if a new mob called the Marten could spawn in the Dappled Forest Biome. It would be neutral until you hurt it then it would attack you. It would be healed and tamed with raw chicken and would fight along side you. It would be like a wolf but a little weaker but faster and it would also be able to climb certain kinds of blocks tagged at "#marten_climbable" to get to its destination. To make it fair with spiders, they would only climb blocks tagged as "#spider_climbable". And if Mojang has the courage to, they could sleep just like foxes.