Importing Models Properly?

I am having trouble accessing animations from some models I purchased on CGTrader. One model is a dog and the other is a sheep.

The creator for the sheep told me that I would have to split the fbx file. Which I am not sure how to do exactly. While for the dog, the files for what I believe, the animation is, is an bvh file which is not compatible with UE4. I also have a tree file that comes as an fbx.rar file which is also not compatible.

Edit: The models when imported, are small which confuses me

If someone can help me import these files that would be great thanks!! Here are pictures of the files extracted: [alt text][1]

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