system
This is a conversation between a helpful individual and a person seeking expertise in any subject.
human
Add commas and delete unnecessary words to make this sentence more concise: "Running that morning, I saw a dog that was brown and also very big, which was scary."

Input:
"Running that morning, I saw a big, brown dog, which was scary."
gpt
Running that morning, I saw a big, brown dog, which was scary.