Wire Fox Terrier vs Jack Russell Terrier

Photo: State Farm

Photo: Արարատ Թրվանց

Side by side

Wire Fox Terrier

Jack Russell Terrier

Adult weight

Males 7.7–8.6 kg (17–19 lb); females 6.8–7.7 kg (15–17 lb)1

5–6 kg (11–13 lb)2

Lifespan

Median 13.5 years3

Median 13.3 years3

Fully grown

10 months, both sexes4

Group

Terrier (AKC)

Terriers2

Coat

No sourced figure

Short coat or wire or harsh coat2

Exercise

No sourced figure

A moderate amount

Health

No sourced figure

Cushing's syndrome (slightly more likely); Torn cruciate ligament in one knee (slightly more likely)5,6

Class

Companion

Sport

Which suits you

Size

The Wire Fox Terrier is larger: about 7.7 kg (17 lb) as an adult, against 5.5 kg (12 lb) for the Jack Russell Terrier.

Temperament

They differ most on affection (Wire Fox Terrier: likes its own space; Jack Russell Terrier: affectionate on its own terms) and on intelligence (Wire Fox Terrier: learns readily, likes games; Jack Russell Terrier: needs daily brain work).

Alike

Both are rated the same on activity: needs lots of exercise.

Neither is the better dog in general. Which suits you depends on your home, your days and the care you can give.

Take the breed matcher

What they're like

Wire Fox Terrier

Terrier · Small

In temperament the breed is bold, lively and quick to react, with a strong urge to dig and to chase.

Jack Russell Terrier

Terriers · Small

In temperament it is lively, alert and bold, quick to learn and persistent once interested in something. It has a strong urge to chase and dig, and can be forthright with other dogs.

The Wire Fox Terrier page →The Jack Russell Terrier page →

Breed traits

Day to day

Wire Fox Terrier

Jack Russell Terrier

Activity

Needs lots of exercise

Intelligence

Differs

Learns readily, likes games

Needs daily brain work

Handler demand

Differs

Needs steady training

Needs an experienced owner

With people

Wire Fox Terrier

Jack Russell Terrier

Affection

Differs

Likes its own space

Affectionate on its own terms

Loyalty

Bonded to its family

Independence

Decides for itself

Around the home

Wire Fox Terrier

Jack Russell Terrier

Sensitivity

Average

Voice

Very vocal

Prey drive

Likely to chase small pets

Breed explains only about 9% of how individual dogs differ in behaviour7. Meet the dog. A good breeder breeds for temperament as well as health, and matches each puppy's personality to the right home8,9.

Puppy growth

Reference curves · both sexes

Summary

Detail

The Wire Fox Terrier grows to the heavier adult, about 7.7 kg against the Jack Russell Terrier's 5.5 kg.

Wire Fox Terrier

Jack Russell Terrier

More comparisons

Compare the Wire Fox Terrier with

Jack Russell Terrier vs Parson Russell Terrier Beagle vs Jack Russell Terrier Jack Russell Terrier vs Rat Terrier Dachshund vs Jack Russell Terrier Wire Fox Terrier vs Welsh Terrier Chihuahua vs Jack Russell Terrier All breed comparisons →

Sources

1
American Kennel Club. Wire Fox Terrier breed standard. ↑
2
FCI. Breed standard no. 345. Fédération Cynologique Internationale. © FCI. ↑
www.fci.be/Nomenclature/Standards/345g03-en.pdf
3
McMillan et al., 2024. Longevity of companion dog breeds: those at risk from early death. Scientific Reports 14, 531 (VetCompass). CC BY 4.0. ↑
doi.org/10.1038/s41598-023-50458-w
4
Hawthorne et al., 2004. Body-weight changes during growth in puppies of different breeds. Journal of Nutrition 134(8 Suppl): 2027S–2030S (WALTHAM). ↑
doi.org/10.1093/jn/134.8.2027S
5
Schofield et al., 2022. Frequency and risk factors for naturally occurring Cushing's syndrome in dogs attending UK primary‐care practices. CC BY 4.0. ↑
doi.org/10.1111/jsap.13450
6
Pegram et al., 2023. Risk factors for unilateral cranial cruciate ligament rupture diagnosis and for clinical management in dogs under primary veterinary care in the UK. CC BY 4.0. ↑
doi.org/10.1016/j.tvjl.2023.105952
7
Morrill et al., 2022. Ancestry-inclusive dog genomics challenges popular breed stereotypes. Science 376: eabk0639 (Darwin's Ark). ↑
doi.org/10.1126/science.abk0639
8
Dogs Trust. Finding a good, responsible breeder. ↑
www.dogstrust.org.uk/dog-advice/getting-dog/choosing-dog/finding-a-breeder
9
American Kennel Club. Screening puppy buyers: how top breeders find the best homes. ↑
www.akc.org/expert-advice/dog-breeding/screening-puppy-buyers-how-top-breeders-find-the-best-homes/
10
Salt et al., 2017. Growth standard charts for monitoring bodyweight in dogs of different sizes. PLoS ONE 12(9): e0182064 (WALTHAM). CC BY 4.0. ↑
doi.org/10.1371/journal.pone.0182064

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