Good job! The sentence is grammatically correct, but we can make it a little clearer for a child.
- Better: A bison's thick fur pushes rain and snow away.
- Even clearer: A bison's thick fur keeps rain and snow away from its skin.
Why this is better:
- We use "bison's" to show the fur belongs to the bison.
- Both "pushes" and "keeps" are okay verbs here, but "keeps" makes it clearer that the fur protects the bison's skin.
Try saying the new sentence out loud: "A bison's thick fur keeps rain and snow away from its skin."