Good Riddles

Question: How far can a dog run into the woods?

Question: what are the next two letters in this sequence: A, E, F, H, I, K, L, M,

Question: What is as big as you are and yet does not weigh anything?

Question: What do you call 2 Us?

Question: My name is Ruger. I live in a farm. There are four other dogs in the farm with me. Their names are Snowy, Flash, Speed, and Brownie. Who is the fifth dog?