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It is not possible to stack form of the dragon and animal growth as a sylvan sorcerer on your animal compamion due to the following text under polymorph subschool,, "In addition, other spells that change your size have no effect on you while you are under the effects of a polymorph spell.", right?
Thus it is probably better(until form of the dragon 3) to cast animal growth as it gives a greater str bonus to your animal companion? Especially when people argue your animal companion isnt smart enough to use breath attacks, passing the dc 25 handle animal check to push or no?
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I don't know. It could work.
Animal Growth
School transmutation; Level druid 5, ranger 4, sorcerer/wizard 5The target animal grows to twice its normal size and eight times its normal weight. This alteration changes the animal's size category to the next largest, grants it a +8 size bonus to Strength and a +4 size bonus to Constitution (and thus an extra 2 hit points per HD), and imposes a –2 size penalty to Dexterity
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Multiple magical effects that increase size do not stack.
Form of the Dragon I
School transmutation (polymorph); Level sorcerer/wizard 6
You become a Medium chromatic or metallic dragon.Form of the Dragon II
This spell functions as form of the dragon I except that it also allows you to assume the form of a Large chromatic or metallic dragon.Form of the Dragon III
This spell functions as form of the dragon II save that it also allows you to take the form of a Huge chromatic or metallic dragon.
I don't see anything in Form of the dragon that say that you necessarily increase your size.
The large wolf that become a large dragon don't change its size. If he become a medium dragon it even decrease it.The large wolf with animal growth on it that has become a huge dire wolf and is the target of Dragonshape III become a huge dragon and don't change its size.
The other limitation is that you can't stack polymorph effects, but animal growth isn't a polymorph effect.
It is weird as the order of effects matter, but remember this part of the polymorph rules:
If a polymorph spell is cast on a creature that is smaller than Small or larger than Medium, first adjust its ability scores to one of these two sizes using the following table before applying the bonuses granted by the polymorph spell.Creature's Original Size Str Dex Con Adjusted Size
Fine +6 –6 — Small
Diminutive +6 –4 — Small
Tiny +4 –2 — Small
Large –4 +2 –2 Medium
Huge –8 +4 –4 Medium
Gargantuan –12 +4 –6 Medium
Colossal –16 +4 –8 Medium
Let's try to see what would happen to a large wolf made huge and then subject to Dragon shape III
Initial stat (for simplicity I disregard the modifiers for the main character level as they change every 3 levels)
Level 7 wolf
Large
Str 21
Dex 13
Con 19
With animal growth
Huge
Str 21+8 = 29
Dex 13-2 = 11
Con 19+4 = 23
add Dragonshape III
Step 1, reduce to medium
Str 29-8 = 21
Dex 11+4 = 15
Con 23-4 = 19
step 2
add dragon form
Str 21+10 = 31
Dex 15 = 15
Con 19+8 = 27
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Without animal growth
Level 7 wolf
Large
Str 21
Dex 13
Con 19
add form of the dragon III
Step one reduce to medium
Str 21-4 = 17
Dex 13+2 = 15
Con 19-2 = 17
Add for of the dragon III
Huge
Str 17+10 = 27
Dex 15 = 15
Con 17+8 = 25
The difference is 4 points of strength and 2 of constitution.
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If you have access only to form of the dragon II you can combine the spells only on an animal with a starting size of medium, if you are limited to form of the dragon I it work only on a small animal.
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RAW it seem to work, RAI I am way less convinced.
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Yet people are arguing that a wildshaped druid cannot use enlarge person on himself as he is under a polymorph effect?
Sorcerers have limited spells known. I wouldn't want to waste spells on things that do not stack. It looks like the divine spell list is better for offensive buffing of aninal companions while the arcane spell list is better for defensive buffing of aninal companions.
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Regardless of your original size Dragon Shape X will set the size as appropriate for the specific spell.
Polymorph says:
You can only be affected by one polymorph spell at a time. If a new polymorph spell is cast on you (or you activate a polymorph effect, such as wild shape), you can decide whether or not to allow it to affect you, taking the place of the old spell. In addition, other spells that change your size have no effect on you while you are under the effects of a polymorph spell.
It doesn't specify whether it's bigger or smaller. It makes no mention of current size versus original size. It just says while polymorphed spells that would change you size have no effect at all.
I think it's pretty clear cut that animal growth does not work on a polymorphed animal, including animals under the effect of Dragon Shape.
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Animal Growth
School transmutation;
Not polymorph.
Wild shape refer to Beast shape, that is a polymorph effect. That is the reason why animal growth+dragon form or other polymorph effects could work as long as the polymorph effect don't change your size, while wild shape+dragon form or other polymorph effects wouldn't work.
It doesn't matter that Animal Growth is not polymorph, the polymorph rules are clear:
other spells that change your size have no effect on you while you are under the effects of a polymorph spell.
Edit: Ninja'd
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The order in which you use the spell matter: first you apply Animal growth change the creature size, then you apply a polymorph effect that don't change it current size.
Alternatively you can apply a polymorph effect that don't change the creature size and then apply animal growth.
Edit: I see, the limit is different under animal growth and the polymorph subschool.
other spells that change your size have no effect on you while you are under the effects of a polymorph spell.
Multiple magical effects that increase size do not stack.
I don't think casting order matters. It does not say that "if a spell causes your size to change..". It says .."spells that change your size ...".
They look similar but a spell that changes your size means "if the spell is designed to change your size", not "if it spell actually changes your size during this casting of it..".
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I don't think casting order matters. It does not say that "if a spell causes your size to change..". It says .."spells that change your size ...".
They look similar but a spell that changes your size means "if the spell is designed to change your size", not "if it spell actually changes your size during this casting of it..".
See the edit, that is what I was missing.
Animal growth allow polymorph spells that don't alter your size, but the general rules about polymorph disallow them, but the animal growth rule isn't a case of specific rule overruling a generic rule, it is an added limitation, as it say that effect that increase your size don't stack, while the polymorph rule is about polymorph and any spell that change your size.The only problem left are all the spells that give you abilities "as if you were a size larger" or "add X to your reach" without being a polymorph effect or a size changing effect.
To often they seem only a tricksy way to avoid the limitation.
I don't think casting order matters. It does not say that "if a spell causes your size to change..". It says .."spells that change your size ...".
They look similar but a spell that changes your size means "if the spell is designed to change your size", not "if it spell actually changes your size during this casting of it..".See the edit, that is what I was missing.
Animal growth allow polymorph spells that don't alter your size, but the general rules about polymorph disallow them, but the animal growth rule isn't a case of specific rule overruling a generic rule, it is an added limitation, as it say that effect that increase your size don't stack, while the polymorph rule is about polymorph and any spell that change your size.The only problem left are all the spells that give you abilities "as if you were a size larger" or "add X to your reach" without being a polymorph effect or a size changing effect.
To often they seem only a tricksy way to avoid the limitation.
Bingo
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Simple answer, ignoring all the rules on polymorph and transmutation:
Animal Growth grants size bonuses.
Form of the Dragon grants size bonuses.
The spells don't stack.