If its cold outside you should put a doggy sweater on him, if its inside you could wrap him in a blanket.
I live in Canada where temperature drop near -30ºc in winter and my Jack Russel can't stand any kind of dog cloths. He walk 3 hours a day no matter the kind of weather. The only times I've seen him get cold is because I was not walking fast enough or I took time to speak with bystander. They stay warm because they are very active have a double coat would be the appropriate answer I guess.
They could be cold, scared, excited or nervous
The Jack Russell is a smaller version of a Fox terrrier. A Fox terrier is derived from a wolf. I belive they just kept breeding small-legged Fox terriers until they got the Jack Russell terrier.
Parson Jack Russell's have longer legs and therefore can run faster
A Jack Russell!! :D
it is spelled the same, "jack russell"
A Jack Russell Tarrier is a small dog
Yes you can, Tea Cup Jack Russell is just another name for a Miniature Jack Russell.
Jack Russell was born on December 5, 1960.
Jack Russell was born on December 5, 1960.
Jack 'Russer' Russell died in 1809.
Jack 'Russer' Russell was born in 1753.
David Russell Jack was born in 1864.