Animal companionL Rhino or Ceratosaurus?

[Abraham Z]

The charge lane issue isn't to do with it being a mount, but to do with the wording of the Narrow Frame feat: "You do not take penalties on your attack rolls or to your AC for squeezing through a narrow space that is at least half as wide as your normal space, though each move into or through a narrow space still counts as if it were 2 squares." If you don't have a 10' wide path to charge through, each square counts as 2 for movement, so you can't charge because it's impeded movement.

Btw, how do you have so many feats at 7? And what gets the ability for your mount to always be flanking?