What are the two only reasons that a musher in the iditarod can be disqualified from the race?

Question

What are the two only reasons that a musher in the iditarod can be disqualified from the race?

Answer 1

using dog steroids

Answer 2

1- A dog dying during the race.

2- Having fewer than 5 dogs on the gangline.

Answer 3

1-having fewer than 5 dods

2-going off course,in route of a short cut