12 inches tall at the most
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...
250g
The average size for a jack russell is 90 feet tall and usually weighs 73Kilos
That depends: if he is a purebred, he can get any where from twelve to fifteen inches. If he is not, then, who knows.
Jacks usually get pretty big all of my jack have needed C sections. They usually have anywhere from 2 to 8 pups.