Jack is a 1 yr old Jack Russell terrier mix. He is a very friendly, energetic little guy. He gets along well with bigger dogs but he is not good with smaller dogs. He is very playful and smart. Because Jack Russell's are known to have high prey drive. would not recommend adopting this breed into a home with cats or other small animals. He is neutered, microchipped, and current on vaccinations. He weighs approx 12 lbs.