Swapping Cavalier mount for Huntmaster's Hunting Pack

[LucyG92]

Is there any reason (for the record, I'm kind of both player and GM here - a bit confusing, I know...) I can't swap out the Cavalier's Mount feature for the Huntmaster's Hunting Pack, without changing any other class features? Would it cause balance problems?

This is the Huntmaster archetype I'm referring to:
http://www.d20pfsrd.com/classes/base-classes/cavalier/archetypes/paizo---ca valier-archetypes/huntmaster/

Our campaign rarely involves actually riding horses.

[Louise Bishop]

Considering Cavalier's are no where near broken or even in the top 3 tiers of power...My answer is:

As the DM you can change anything you want and No it will not cause Balance problems at all.