both are small breed dogs average 6 to 25 lbs
Due to the American Bulldogs greater size, weight and muscle mass the Jack Russell Terrier would have very little chance in a fight.
about The same size as jack russell teriers
about 5/8 inches
The jack Russell can have about up to 12 puppies ;
They are related to parson terriers the parson terrier has a larger chest and a longer head and overall have a bigger body size also the jack russell originates from england, hoped this helped :D
Preferably NOT something smaller than the Jack Russell! JRTs (Jack Russell Terriers) are quite competitive, as I'm sure you know, and have rather a short temper on the whole. A small breed dog would be at a disadvantage in a fight with the bigger dog. Therefore, it would seem that another terrier breed around the same size would be the best choice. I personally have a shepherd/husky cross & 2 JRTs......the larger dog is undisputed alpha dog, but the two smaller ones are constantly wrangling for dominance.
According to the Jack Russell Terrier Club of America breed standard, a true Jack Russell is between 10 and 15 inches high at the withers (top of the shoulder blades). However, there are a lot of JRTs or mix breeds that don't quite conform to this standard. Generally, you won't get one over 15 inches at the withers - that would be a Parson Russell, which is slightly different. Source: See related links
Well, a 12inch jack Russell can jump 5ft eaisly so depending on yours size you should be able to work out from that, i have a 6 month old puppy that is a cross between a parson jack Russell and a jack Russell she can jump about 3ft already and can run 100m in 13 seconds
at 4 months jack Russel terrier is going to be 12cm..... and my jack Russell is 12cm and she is 4 months.
Jack Russells usally have 4-8 pups, depending on the age and somtimes size of the jack, a smaller jack can have as little as 3 but can still have a much as 8. If the dog is still young i.e 1-1/2 then they might have 3 but somtimes can still have a much as 8.
chihuahua mixed dogs with jack russells are a ittle bigger then a normal sized chihuahua pretty much they are the size of a jack russlle. also you can look at pics they are very cute.
Jack Russells vary in size. The average in weight around the world is about 14 pounds.hope this helps alot!