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I have an animal companion which has just gained its 5th HD. On page 291 of Monster Manual 1, the Improving Monsters section says that an increase in Size also changes stats.

Do animal companions (e.g. from Druid or the Wild Cohort feat) increase in size based on their HD, and if so, do they also gain the stat adjustments from MM1 p291?

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up vote 7 down vote accepted

No, in D&D 3.5, animal companions do not grow in size due to bonus HD. It does not clearly state this in the core rules but is explicitly stated in a Skip Williams rules article on animals on Wizards's site.

Like many things, this was improved in Pathfinder, where specific size increases are defined per animal companion type explicitly in the rules.

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A druid's animal companion is not a standard monster or animal. The bonus hit dice do not change its size, but instead it receives other special traits when the druid advances, as outlined in the Player's Handbook, page 36.

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thank you for your help –  Novian Dec 31 '12 at 7:42
    
This is what I thought the explicit rule was, but I've been unable to find any place a moratorium on growth is actually written. Can you provide a citation? Because I'm stumped. –  BESW Dec 31 '12 at 8:39
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@BESW Page 36 seems to be the only explanation of animal companions, and it doesn't mention anything about size changes. Likewise, it doesn't mention animal companions turning into a tarrasque, either. –  okeefe Dec 31 '12 at 9:29
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