French Mastiff: $3,000
Though French Mastiffs have come back from the brink, there are still only around 5,000 in the United States. Interested buyers can expect to shell out around $3,000 for a puppy.
Anaheim Angels' Jeff DaVanon, right, bends down to pet Hootch, a French mastiff, as other dogs and their owners walk around U.S. Cellular Field before the start of the Angels game against the Chicago White Sox, Saturday, May 29, 2004, in Chicago. During the pet friendly promotion dog owners were encouraged to bring their pets to the ball park and circle the field before the game. (AP Photo/Jeff Roberson)