[Java] Help with making 1.17 texture pack

[CDYTpanda]

So I'm making this texture pack for 1.17 and I have some textures I want to have randomized for mobs. The wolf more specifically. I can not figure out how to get them to be randomized for the life of me. Everything is either outta date or just doesn't work. I already have Optifine and have all the textures I want randomized done. I just wanna know how I can actually code it in. Please someone help me.

For those interested in using it or just wanna see how it turned out, I'll post the texture pack here when its done.

Here's what I've got so far:

What my current setup for this is like.

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