Be nice to them, understanding, caring and look after them. Make sure they have nice facilities and remember they are human too!
You should really take it to the vet and they will give it a proper examination but in the meantime keep it warm and try to get it to eat and drink.
Jack russells are quite healthy.
Skateboarding is a very rewarding subject and is very healthy. It is an enjoyable sport and is also a form of transportation. Is should be allowed all places.