Logic Riddles

Question: There is a mother dog. She gives birth to four puppies named: Sloppy, Poppy, Doppy, and Roppy. What is the mother's name.

Question: A father and his son are in a car accident and the father dies on the scene, so the father is out of the picture. The son is brought to the hospital and when he arrives, the surgeon said, "I can`t operate on my own son!" Who is the surgeon?

Question: I am very strong and tough but can be broken in some ways. What am I?

Question: If it takes three men two days to dig a hole, how long does it take one man to dig half of a hole?

Question: Four cars come to a four way stop, all coming from a different direction. They can't decide who got there first, so they all go forward at the same time. They do not crash into each other, but all four cars go. How is this possible?