Very intelligent and trustworthy.
15 years life expectancy. The Jack Russell Terrier can hunt,track, and even can be a great pet to have around children. Common problems could be weak knees,eye diseases,hip problems and of course could become deaf in it's older age, but that's to be expected with most dogs.
Bathe only when necessary and use a firm brush to comb its coat.
Approximate Size of a Jack Russell Terrier
Height: 10-15 inches (25-38 cm)
Weight: 14-18 pounds (6-8 kg)