English Pointers have Tracking and Huskies have Chasing which help improve the chance to find a Rare animal. The requirements/recommendations can help you figure out what amount is recommended/required to make the hunt easier.

Once you have the necessary dog equipped, the Tracking/Chasing fields will denote the amount required. This ability can be trained by tapping the recommendations or requirements text, or manually by visiting the Dog loadout, tapping on Train and upgrading the respective ability: