Working Dog Breed Directory

German Shepherd

Typical lifespan

12–14 years

Adult size

Males: 65–90 lb, 24–26 in. Females: 50–70 lb, 22–24 in.

Origin and original purpose

Germany; standardized from regional herding dogs in the late 1800s. Developed to manage sheep and selected for trainability, endurance and useful working structure.

Registry recognition

AKC: 1908.

Litter size

AKC reports an average of about 8 puppies; smaller and larger litters occur.

General characteristics

Intelligent, responsive and versatile. Working ability depends on the individual dog, sound health, training and consistent handling.

Official Breed Registries

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Belgian Malinois

Typical lifespan

14–16 years

Adult size

Males: 60–80 lb, 24–26 in. Females: 40–60 lb, 22–24 in.

Origin and original purpose

Belgium; one of the Belgian shepherd varieties, associated with the Malines region. Originally selected for herding, agility and sustained work; later used in police and other working roles.

Registry recognition

AKC as a separate breed: 1959.

Litter size

Varies by the parents and pregnancy. The registry profile does not publish a breed-wide litter average; see the litter-size guide below.

General characteristics

Athletic, highly energetic and strongly engaged with a handler. Needs substantial daily activity, structured training and an appropriate working environment.

Official Breed Registries

UKC and FCI cover Malinois within the Belgian Shepherd Dog standard.

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Rottweiler

Typical lifespan

9–10 years

Adult size

Males: 95–135 lb, 24–27 in. Females: 80–100 lb, 22–25 in.

Origin and original purpose

Germany; descended from cattle-driving and guarding dogs associated with Roman drover stock. The breed developed around Rottweil as a powerful livestock and property worker.

Registry recognition

AKC: 1931.

Litter size

AKC reports an average of about 8 puppies, with substantial variation between litters.

General characteristics

Strong, confident and observant. Early socialization, controlled handling and a suitable assignment matter more than an imposing appearance.

Official Breed Registries

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Doberman Pinscher

Typical lifespan

10–12 years

Adult size

Males: 75–100 lb, 26–28 in. Females: 60–90 lb, 24–26 in.

Origin and original purpose

Apolda, Germany, around 1890; developed by Louis Dobermann for personal protection. Its ancestry combines several working dogs rather than one documented, fixed cross.

Registry recognition

AKC: 1908. This differs from earlier recognition in its country of origin.

Litter size

A Norwegian Kennel Club study reported a mean of 7 puppies across 45 litters recorded in 2006–2007; this is historical sample data, not a prediction.

General characteristics

Alert, quick and responsive to training. A lean athletic build and short coat do not remove the need for shade, water and climate-aware care.

Official Breed Registries

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Cane Corso

Typical lifespan

9–12 years

Adult size

Males: 25–27.5 in. Females: 23.5–26 in. Weight should be proportionate to height.

Origin and original purpose

Italy; a molosser-type working guardian with ancient ancestry. Developed for practical farm and protective work, with a modern recovery of the breed following declining numbers.

Registry recognition

AKC full recognition: 2010; Foundation Stock Service recording began in 1996.

Litter size

Not a fixed breed characteristic. The registry profile does not give a breed-wide litter average; individual breeding records and veterinary assessment are more useful.

General characteristics

Large, strong and confident. Stable temperament, early socialization and reliable control are essential for any working role.

Official Breed Registries

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American Pit Bull Terrier

Typical lifespan

Approximately 12–16 years; individual health and care affect longevity.

Adult size

UKC desirable weights: males 35–60 lb; females 30–50 lb. Approximate height: males 18–21 in; females 17–20 in.

Origin and original purpose

Developed from nineteenth-century British and Irish bulldog-and-terrier stock. In the United States these dogs also worked with livestock, hunted and served as companions.

Registry recognition

UKC: 1898. UKC recognition is distinct from AKC recognition; “pit bull” is also used loosely for several different breeds and mixes.

Litter size

Varies; no breed-wide litter average is given in the UKC standard. Do not infer litter size from appearance or a pit-bull label.

General characteristics

Athletic and strong. Assess the individual dog, behavior history, socialization, containment and assignment requirements.

Official Breed Registries

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English Mastiff

Typical lifespan

6–10 years

Adult size

Males: 160–230 lb and at least 30 in. Females: 120–170 lb and at least 27.5 in.

Origin and original purpose

Britain; an old mastiff-type guardian developed for strength and protective presence. The modern Mastiff is a distinct breed, not a label for every large guardian dog.

Registry recognition

AKC, under the name Mastiff: 1885.

Litter size

Varies substantially. The AKC breed profile does not publish a breed-wide litter average; large body size does not guarantee a large litter.

General characteristics

Very large and powerful, often comparatively measured in movement. Physical condition, mobility, climate and the individual temperament determine a suitable role.

Official Breed Registries

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Dutch Shepherd

Typical lifespan

11–14 years

Adult size

Approximately 42–75 lb and 21.5–24.5 in at the shoulder.

Origin and original purpose

The Netherlands; developed naturally as a versatile farm and shepherd dog. Original duties included herding, livestock movement and guarding the farm.

Registry recognition

AKC Foundation Stock Service: April 2012; Miscellaneous Class: January 1, 2017. These stages are distinct from full breed recognition.

Litter size

Varies with the parents and pregnancy. The registry profile does not give a breed-wide litter average; see the general litter-size information below.

General characteristics

Lively, intelligent and active, with an independent streak. Needs consistent training and both physical and mental activity.

Official Breed Registries

The AKC page describes the breed in the Miscellaneous Class; this is distinct from full recognition.

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Giant Schnauzer

Typical lifespan

10–13 years

Adult size

Males: 75–95 lb, 25.5–27.5 in. Females: 55–80 lb, 23.5–25.5 in.

Origin and original purpose

Bavaria, Germany, in the nineteenth century. Developed from larger working schnauzer stock and other drover dogs to move cattle and guard farms and businesses.

Registry recognition

AKC: 1930.

Litter size

A Norwegian Kennel Club study reported a mean of 7 puppies across 42 litters recorded in 2006–2007; individual litters varied widely.

General characteristics

Strong, alert and trainable. Substantial exercise, purposeful training and regular coat care are part of the commitment.

Official Breed Registries

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Bullmastiff

Typical lifespan

7–9 years

Adult size

Males: 110–130 lb, 25–27 in. Females: 100–120 lb, 24–26 in.

Origin and original purpose

Nineteenth-century Britain; developed by crossing Mastiffs and Bulldogs to assist estate gamekeepers in finding and restraining poachers. Historically known as the Gamekeeper’s Night Dog.

Registry recognition

AKC recognition list: 1934.

Litter size

Varies. The AKC profile does not provide a breed-wide average; a reproductive veterinarian can advise on an individual pregnancy.

General characteristics

Muscular, powerful and observant. Suitable exercise, early socialization and responsible handling remain important despite a comparatively calm appearance.

Official Breed Registries

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