A player in my group rolled up a 3rd level (Revised) Beast Conclave Ranger. Now we are unsure how to apply the benefits of the Animal Companion to his wolf. Some of them are straightforward, for example AC and damage. The wolf in the Monster Manuel has 13 AC (--> 10 base AC, +2 DEX, +1 natural armor). The Level 3 Ranger has a Proficiency Bonus of +2, so the wolf would have an AC of 15. The Bite attack does 2d4+2 damage, plus Proficiency Bonus = 2d4+4. The wolf does not have any modifiers to Saving Throws, so now it gets +2 to all of them.
Now the complicated part: skills. The ranger player argues that the wolf already has two skill proficiencies (Perception and Stealth) and would get two more. I don’t think so. In my opinion the wolf gets two proficiencies altogether and the two most logical skills to choose would be Perception and Stealth. The panther for example, another choice for an Animal Companion, has Perception +4 and Stealth +6. If the panther would have Skill Proficiency in Perception and Stealth (and a Proficiency Bonus of +2), it would have Perception +4 and Stealth +4. Therefore, my conclusion is that these bonuses to skill rolls are just bonuses very similar to Proficiencies, but not really Proficiencies.
And finally the attack bonus. Its Bite Attack has a +4 attack modifier. Why +4? Is that just a semi-random number based on the Challenge Rating of the wolf? Or is there a proficiency bonus somewhere in there? Could it be +2 from proficiency bonus and +2 from DEX = +4? I thought so at first. But wouldn’t the Bite attack be STR-based? Not only because it would make sense, but also because the Saving Throw for the opponent is STR-based? But then the attack bonus would only be +3.
Thanks in advance for you help.