Felguard simple fixes
The felguard is weak and bugged. The bug causes him to do even less damage. So, if the Felguard has such weak damage (even if fixed), why not just let warlock pets scale from more talents from the beast master tree?
So many pet talents are worded to explicitly exclude summoned demons and it just feels needlessly prohibitive.
Further, he has 1 enchant that is directly for him. And it's not even an uniquely made enchant; it's pulled from an existing lock talent. Searing Pain and Hellfire has more support than that.
For such a signature skill, I think you have to admit this is lackluster. In response, I'm not even suggesting you overhaul, bugfix, or add new enchants. Rather just to be included in a more talents that already effect other pets.