Long leg Jack's get to be about 20 inches or shorter on all fours and no longer than about 14 inches long.The short leg Jacks get to be about 14 inches or shorter on all fours and no longer than...
I dont know all I know is that they are the smartest dog in the world go to youtube and look at useful dog tricks by jessehttp://juliet6.blogspot.com
12 inches tall at the most
They grow about 1 to 2 ft. long