How do I increase the bond level for buddies?

In Metal Gear Solid 5: The Phantom Pain, you unlock items and accessories via a bond level. Is there a way to increase the bond level? Will it affect other things (it would make sense)?

metal-gear-solid-5-the-phantom-pain

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How do I increase my buddy Bond?

For starters, Trainers have to feed their buddies Berries to increase their Buddy Level to Good Buddy....You can increase your Buddy Level by doing the following:

Playing With Your Buddy Pok\xe9mon.

Feeding Your Buddy Pok\xe9mon Treats.

Battling and Exploring With Your Buddy Pok\xe9mon.

How do I check my buddy bond level?

You can see the bond levels when you're in the sortie screen, just go to buddies and it'll show on the right side.

How do you level up bond with D horse?

D-Horse's bond level can be increased by +1% for every 36 seconds he is ridden.

Is DD a wolf?

At Tokyo Game Show today, series creator Hideo Kojima revealed DD, a wolf who can aid Snake during certain infiltrations in The Phantom Pain.

MGSV:15 Advanced Tips, Easy GMP and Buddy Bond!

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Images: Brett Jordan, Brett Jordan, Josh Willink, APG Graphics