Level Up (A5E) Heroic monsters and animal companions

[VenerableBede]

... Why not have both an animal companion archetype and a heroic companion?...
Has not actually read the Heroic Companions rules, does not know if this is RAW/RAI.

 

[Verall]

Is there a limit on the amount of heroic companions you can have?
My mount is int 6 and my familiar is int 10, would be cool to give them both heroic levels