Most Jack Russells will reach their full size between 6 – 8 months but will continue to ‘fill out’ and bulk up until around 12 months of age. The rate of their growth is dependent on their genetics, health, and diet so each dog will develop in a different way.

between 13 and 14 inches tall

Yes, Jack Russell Terriers make good family pets. Jack Russell’s are loving and affectionate dogs. Jack Russell’s if trained and handled correctly, grow close bonds with all family members. Jack Russell’s strive to please their owners and make loyal and protective pets.

Fox terrier and Jack Russell are two different breeds, but both originated in the same country. Fox terrier is little bigger in size, and weighs slightly more than in Jack Russell. The muzzle is more pointed in Jack Russell than in Fox terriers. Jack Russell terriers are more athletic compared to Fox terriers.

Unlike most breeds, terriers were bred to work independently of people. Terrier authority Pam Bishop of the Fox Terrier Network says that Jack Russells are actually fairly easy to train but that training must be done differently than with other breeds. She stresses that terriers just want to have fun – literally!

Russells can turn aggressive and dangerous, but there can be various underlying causes for this. Belonging to the terrier class, these dogs naturally possess a high prey drive, and the hunting instinct often drives them towards jealousy and aggression.

Jack Russells are commonly known to harass, injure or kill other small pets, such as cats, birds, rabbits, mice, rats, gerbils, etc… simply due to their strong natural hunting instincts. Raising a Jack Russell puppy with a cat does not guarantee the cat’s life-long safety.

Most Jack Russells will calm down with age. Your Jack Russell will calm down as he moves into seniority from the ages of 10 to 12 years.

Top 9 Tips for Stopping Your Jack Russell Terrier from Peeing Indoors

1. Tip #1- Start Training Your Jack Russell to Pee Outside Immediately.
2. Tip #2- Always Provide Enough Exercise for Your Jack Russell.
3. Tip #3-Reward Your Jack Russell Peeing Outside.
4. Tip #4-Do Not Punish Your Jack Russell If They Pee Inside The House.

Jack Russells can be very destructive if left unattended and unemployed! Most behavioral problems are due to a lack of companionship, discipline, activity and exercise. If you’ve only seen perfect, well-behaved JR’s, they are ones that were lucky enough to be exercised, well socialized, and trained.

The small terriers are known for being particularly vicious Merseyside Police found more reports of canine attacks on humans involving Jack Russells than any other breed in 2015. The terriers were found to be more aggressive than other breeds of dogs that are perceived to be aggressive, like pit bulls or bull terriers.

The Life of a Jack Russell Terrier Though common hereditary illnesses for Jack Russells can include eye, ear, and patella (knee) problems as well as several genetic diseases, the most common cause of death for this breed is being hit by a car.

Jack Russell’s shake to expel excess energy that has built up. Since the Jack Russell breed has high energy levels they need to make sure it is burnt off, and if they don’t, they tend to try to expel it by shaking or trembling. Expelling excess energy is the most common reason why they shake.