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
it is spelled the same, "jack russell"
A Jack Russell Tarrier is a small dog
A Jack Russell!! :D
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 Russell has written: 'Nelson and the Hamiltons' '\\'
Jack 'Russer' Russell died in 1809.
Jack 'Russer' Russell was born in 1753.