# What's the damage of a T. Rex animal companion under Animal Growth and Strong Jaw?

I'm a druid with a level 7 T. Rex animal companion. When casting Animal Growth and Strong Jaw on it, what does its base damage roll become? Without AG and SJ it is 2D6. It is a bit confusing as I have read on other forums different answers. Could you provide your reasoning why it is what you say it is, so it will be easier for me to understand?

Secondly, how would the Trex's 7th level "Strong Bite" ability come into play? Would it be +20 damage because you would technically have STR 30 (22 base without AG) at that point with Animal Growth the size of the Trex would go from large to Huge resulting in a +8 to STR. Is this correct?

The relevant table for damage dice is hidden under the description of the feat Improved Natural Attack. The damage progression goes as follows:

1d2, 1d3, 1d4, 1d6, 1d8, 2d6, 3d6, 4d6, 6d6, 8d6, 12d6.
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Animal Growth increases the T. Rex's size, which moves its damage dice up one slot on this table to 3d6. Strong Jaw does not actually change the size of its target, but does move its damage dice up two slots.

1d2, 1d3, 1d4, 1d6, 1d8, 2d6, 3d6, 4d6, 6d6, 8d6, 12d6.
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Total, the spells move us up 3 slots on this table, landing us at 6d6, which is the new value of your animal companion's base damage dice. It started at Large size and is now one size larger, making it Huge. The actual increase in size also grants it a +8 bonus to strength.

I messed up the damage bonus calculations to start, but Anne Aunyme got it right in their answer. After all the buffing, your companion will have 30 strength, giving it a +10 modifier. Strong Bite lets it apply twice its strength modifier to damage, giving it a total damage output of 6d6+20 per attack.

Considering Strength, your Tyrannosaurus starts with 14, gets +8 at lvl 7 and +8 as a size bonus from Animal Growth -> It makes a total of 30, so a +10 modificator. With Strong Bite it means it will add 20 to its damage rolls.