The preposition in question is "on", and its purpose is to show you where the dog chewed. You can remove the preposition to form the sentence "The brown dog chewed the rawhide bone." You can also rearrange it to find the preposition, "on the rawhide bone, the dog chewed" in what is commonly known as the Yoda technique.
Answer: The Vern is catching
1. They dark and gloomy sky started to downpour.
2. The humongous football stadium was jam packed with people standing shoulder to shoulder to watch the game
3. The woman became furious
