Quotes below from The Official English Jack Russell Terrier Site of the EJRTCA (History):
'Owning an English Jack Russell Terrier is better than watching the TV or movies. On your worst day they can make you smile.'
'Jack Russell Terriers are a challenge, they own you, you do not own them. If we can learn one thing from them it is to live life to the fullest.'
'Owning an English Jack is like having a big dog in a small body, or a two-year-old child even in their old age.'
'They prefer to be with you 24/7. They love to sleep with you, hunt with you, ride in the truck with you, work with you, laugh with you and cry with you because they seem to have so much intelligence they know when you are down and want to be by your side.'
Quotes below from the Jack Russell Terrier Club of America (Breed Index):
'The Jack Russell is a happy, bold, energetic dog; they are extremely loyal, intelligent and assertive. Their greatest attribute is their working ability, closely followed by their excellent qualities as a companion.'
'While adaptable to a variety of environments, they are first and foremost bred to be hunting dogs. City or apartment living, or a confined or sedate lifestyle, do not meet the needs of a Jack Russell. These little dogs require what may seem to be an extraordinary amount of human attention, outdoor activity, exercise, discipline and an understanding and acceptance of their hunting nature.'
'Jack Russells can be very aggressive with other dogs, and in fact more than two should never be kept together unattended. There have been many instances of terriers being hurt, even killed, by their fellow terriers; even young pups over the age of eight weeks must be carefully monitored.'
'One of the Jack Russell's most surprising qualities is a kind and gentle nature. He is usually friendly with small children, provided the child understands how to properly handle the terrier. Having the natural assertive terrier characteristics, however, the Jack Russell will not put up with even unintended abusive nature from a child.'
Quotes below from the Jack Russell Terrier Club of America (Bad Dog Talk):
'Many experienced, as well as inexperienced, dog owners are overwhelmed by the demands of a Jack Russell Terrier, leading to the dogs being abandoned even before they reach adulthood!'
... are first and foremost hunting dogs. The traits and skills that make them excellent hunting dogs (i.e., digging, barking, aggressive nature, ability to follow scent) are often interpreted as bad habits that cause people to give them up.'
... are a big dog in a little body. They have the same need (or more!) for exercise as a much larger dog... and the mentality to match -- they think they are at least 150 pounds, and are fearless, often challenging other dogs three times their size.'
... are often aggressive with other dogs. Same-sex aggression and aggression towards other breeds of dogs is well documented with this terrier. It is strongly recommended that no more than two Jack Russells (of opposite sex only) ever be permitted to stay together unattended.'
... can become very possessive of their owner or a favorite member of the family or of what they consider to be their personal property if allowed to do so to the point of showing aggressive protective behavior that must be controlled from an early age.'
... 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.'
... are country dogs. When made to live in a city or suburban-type environment, their needs and instincts do not change. It would be unreasonable to expect them to be anything other than what they are genetically bred to be -- a serious hunting dog. Your lifestyle must be adjusted to meet their needs; they must have jobs to perform -- an outlet for their considerable energy and intelligence.'
... require a long-term commitment to obedience, activity, exercise and entertainment... their unique character, intelligence and high energy level can frustrate you, will undoubtedly entertain you, and can bring you great joy (when they're happy!) or great grief (when they're not!). If this type of relationship does not appeal to you, then consider another breed. Jack Russell Terriers are always a work in progress!'
Quote below from Jack Russell Terrier Club of Canada (Is There A Jack Russell In Your Future?):
'When inviting a dog to join your household, it is very important to learn about the breed you are interested in. A Jack Russell Terrier, as with any other terrier, can have character traits associated with its enthusiastic, energetic nature that you may find undesirable.'
Quotes below from Essortment (Is A Jack Russell Terrier Right For Me?):
'The very characteristics that make a Jack Russell a champion are the same characteristics that make it unsuitable for many families. They dig furiously, they bark, they are relentless when they want something. (Prey, food, a sock, a Barbie Doll's head?) They are extremely territorial, they often don't get along very well with other dogs, especially dogs of the same sex. And according to many sources, they will kill your cat.'
'Jack Russell Terriers also need enormous amounts of exercise. The most common phrase echoed around the country from breeders and trainers is "A tired Jack is a good Jack." An hour a day of running, playing chasing and digging is the bare minimum. Ask any self-respecting Jack Russell himself, and he will tell you three hours is more like it.'
'You still want to get a Jack Russell puppy for your kids? Keep in mind that the typical Jack doesn't tolerate small children very well. A reputable breeder will most likely refuse to place a Jack Russell in a home with children younger than age five . . . They also have zero tolerance for their ears, tails or feet being pulled on, and unlike a Golden Retriever or Lab, they will NOT make special allowances for children.'
'According to Jane McClay, a private rescuer of Jack Russells in Maine, most rescue dogs would make wonderful family pets, for families familiar with the breed. "Most of the dogs I get in rescue aren't given up because there is something wrong with them, but rather just because they're Jack Russells and people didn't do their research. The dog is FINE and it's the owner that just shouldn't have gotten this breed."'
'They can be very difficult and stubborn to potty train, also. Are you willing to clean up messes in the house potentially for 10 to 12 months?'
Quotes below from Jack-Russell-Terrier.co.uk (So You Want A Jack Russell?):
'Jack Russells want to be the centre of attention.
If you want a dog that is happy to sleep quietly in the corner, then don't get a Jack Russell! When bored, they will create new and fun jobs for themselves, or alternatively start destroying things!'
'Jack Russell's are great guard dogs.
They can become very territorial, protecting their domain with endless effort. They are fearless and embody the cliche "a big dog in a small dogs body". They will defend you if you're approached by strangers in the street.'
They will dig, both in the garden and they'll dig "phantom" holes indoors (which is hilarious!). They'll bark, guard, hunt insects and react aggressively to external noise. It is essential that you have a secure outdoor area for them.'
'What are they like to walk?
They have unlimited energy and require a lot of exercise. Be prepared for long walks in all weather. Such is the strength of their instinct and natural curiousity, they will bolt or "go hunting!" They do not fear larger dogs, indeed aggression is sometimes foolishly displayed.'
Despite anything that you read from other sources, a Jack Russells relationsh ip with children depends entirely on the individual dog. One of my Jacks adores children of all ages whereas the other becomes violently possessive of me in the presence of kids.'
'In summary all I can say is that if you want the biggest reward that being a dog owner can give you, want amusement, companionship, and love, then there really is only one choice!'