Can you take a favored class bonus before you have the class feature?

[Name Violation]

Can you take a favored class bonus before you have the class feature?

There are quite a few favored class bonuses that contribute to a class feature gained after first. When can you start taking the favored class bonus?

[DonDuckie]

Yes, but no benefit until you have the class feature.

Favored class bonuses have no requirements

[Mister Fluffykins]

DonDuckie's got it right, I think. Only exception would be Favored Class bonuses for spellcasters that say "Add one bonus spell/formula. Must be at least one level below the maximum you can currently cast."

[Name Violation]

those call out things known. im talking about things like

Half-Elf Add +1 skill rank to the ranger's animal companion. If the half-elf ever replaces his companion, the new companion gains these bonus skill ranks.

Human Add +1 hit point or +1 skill rank to the ranger's animal companion. If the ranger ever replaces his companion, the new companion gains these bonus hit points or skill ranks.

Half-Orc Add +1 hit point to the ranger's animal companion. If the Half-orc ever replaces his animal companion, the new animal companion gains these bonus hit points.

Human Add +1/4 to the monk's ki pool.

ratfolk The alchemist gains +1/6 of a new discovery.

[Diego Rossi]

As a general rule I would say yes, but you must check the wording of each feature and each bonus.
And remember, you don't have a class feature until you get it, so you can't "target" if if the favored class bonus require you to choose something:

Pathfinder Design Team wrote:

FAQ: http://paizo.com/paizo/faq/v5748nruor1fm#v5748eaic9qt8

When do I count as having a class feature?

You have a class feature when your class description tells you you gain that class feature, generally based on your level in that class (and perhaps altered by factors, see below).

If you have an archetype or other rules element that replaces that class feature, you do not have that class feature. For example, if your archetype replaces a rogue's sneak attack, you no longer have the sneak attack class feature (whether a requirement is as general as "sneak attack" or as specific as "sneak attack +1d6," you do not qualify for it).

If you have an archetype or other rules element that replaces part of a scaling class feature, or delays when you get that class feature, you do not have that class feature until you actually gain that class feature.