It must be 何らかの動物.
#1 is OK, but #2 doesn't work.
どんな and どの are both attributives. Unlike 誰, どこ or 何, a noun is needed after it.
e.g.
彼女がどんな本を読んでいるのか知らない。
I don't know what book she is reading.
壊れているのはどの像か教えてください。
Please tell me which statue is broken.