Island Grey Wolf Animal Companion and Knockdown

[Nihm]

The wolf companion (the smaller one, not the dire wolf) has both knockdown and improved knockdown as feats, but only uses the former.

[VanillaPudding]

Illusionary Doom Knight does this as well from the illusion theme.

[JMuzz]

I thought Improved Knockdown just supplements regular Knockdown when taken?

[VanillaPudding]

No it's a separate thing.

[Nihm]

Is it possible to remove knockdown so they only use Improved ?