We had a desexed male Jack Russel for about 12 years.
The breed should look like they have a little bit of staffy bull terrier in them, as that's how the Parson Russel bred them. So should have deeper chest and stronger jaw structure than a foxy...a lot of the animals sold as Jack Russels in Oz are clearly not this way.
Ours was from this kennel, but short haired.
http://www.missigai.com/page4.asp
Little dog that thinks it's a big dog.
As others have mentioned training is imperative, but that won't always over-rule their nature, particularly when it comes to food or fighting...seeing him running around full tilt with his nose in a chicken carcass, and the entire thing covering his eyes because he knew we would take it off him was funny...the day he ate a chicken stock cube not so much.
The ones I've known don't really have a clear definition of where play stops, and roughhousing would sometimes end up in a decent bite...remorsefull dog afterwards, but my bigger dogs always knew where the line was.
Ours was an inside/outside dog, but always slept in his kennel outside, in a "Run" about 6' wide and 12' long. When we were in bed/at school/work, he was in his run, when we were home he was wherever in the yard.
Needed to be vigilant around gates, as he liked exploring.
One of his favourite "toys" was a knotted rope hung from the car port roof...he'd leap up, grab it and hang, swinging wildly to try to tear it down...wore him out pretty good.
Food was always his problem, and he ended up getting baited (fortunately a quick acting poison, not crushed glass)...could never train him not to take food.