3rd level druid spell Magic fang,Greater gives you a +1 to attack and damage for every four caster levels (druid levels). You get it at level 5 so that is a minimum of +2 to both attack and damage. The duration is awesome (1 hour/level) so it may or may not last all day for you (though with some metamagic extend this is no longer an issue) and when you get to higher levels it will last all day. It will only allow you to bypass magic DR.
Hope this clarifies a little.
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I'm guessing you might be asking about summons? Unless you can take an elemental as an animal companion, or I suppose you could be asking about wild shaping...
Anyway, if asking about summons:
Sunlight Summons
Your summoned minions shine with the power of the sun.
Prerequisites: Spell Focus (conjuration), able to cast
summon nature’s ally.
Benefit: Creatures that you summon shed light as a light
spell. They are immune to blinding or dazzling effects,
and their natural weapons are treated as magical for
overcoming damage reduction.
There is also starlight summons which gives bonus to stealth, blindfight, and is able to bypass cold iron DR or moonlight summons which becomes immune to confusion or sleep effects and bypasses silver DR