I'd agree with Posh, build up distance slowly to get pup used to them, and build up joints and paws, too much to soon can damage young dogs, and make them have problems in later life. Most of importantly train her/him to respond to your commands, especially for Terriers, Leave and Come Here/Back, Terries have been bred to "hunt", and if you let dog 'off lead' you have got to be CERTIAN it will do as told!! If not you could' lose' dog in fox hole, gets in but can't get out, or if in farmland might even be shot by farmer for 'worring' livestock!, which is perfectly allowed to do!! Hate to be so depressing but these things have happened, enjoy your dog, hope you have as much fun/happyness as I've had with mine, and as a last thought, some dogs can live 15yrs or more. so be prepared,. h