A boost is a bonus that allows you to give your wolf up to 250 potential points for a certain character trait instead of the standard 200 points. The exception is Divine Health, which gives your wolf 150 maximum health points.
To get a boost, you can buy one under Trading Post and use the search filters to search for a boost wolf, or you can try to breed for a boost pup. Boosts are inheritable, but having boost parent(s) only slightly increases your chances and will not guarantee a boost pup. A wolf cannot have multiple boosts.
Here is a guide to what each boost does:
https://wolfplaygame.com/forums.php?f=29&t=102
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