How to do animation mask ? part2

Hi there.
This is the second time I have used here.

Pasted the previous question below;
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I'd like to know about an avatar mask.

https://unity3d.com/jp/learn/tutorials/topics/animation/avatar-masks
According to this link, it can be easily masked with a humanoid model.
But I want to use it to generic rig like for animals.

are there any ways to use avatar mask to generic rig hopefully without the script... If possible.
But any ideas are welcome and worth. even script, I try to handle it.
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And someone answered to me,
"Yeah, you can make an avatar mask for any model. Create the avatar mask, drag in the model in, and select the bones you want to exclude."

After that, I tried those things and it was going well.
At the same time, I faced a new problem.

First of all, let me explain what I prepared before ask you what is the problem.

2 animal characters
: rabbit(head/body/foot/tail) scale1.1.1
: rabbit(head) scale 1.1.1 (body/foot/tail) scale0.7.0.7.0.7

↑I prepared 2 type of characters.
They are mostly the same objects just except scale.
their skinning is already done so control the size by scaling rig.

scale 1.1.1 is adult, scale 0.7.0.7.0.7 is a kid.
so I just wanna make kids easily in maya.
and animation as well.
That's why I did this.

Transform and rotate animation were properly imported to the character.
But scale animation wasn't.
Because diffrent size.

Can anyone fix this?
I might write enough information here.
If you feel it, Pls tell me too.



Thanks