American Bulldog

Working

Large

10–15 y

AKC Working group · Derived from the adult weight midpoint (35.7 kg)

Wikidata (CC0) · no measured cohort for this breed

The American Bulldog is a large, muscular breed of mastiff-type dog. Their ancestors were brought to the British North American colonies where they worked on small farms and ranches.

Confident

Loyal

Friendly

Summary from Wikipedia (CC BY-SA) · reference ranges from the Kintail breed dataset

Adult weight

Reference

Male

34–45.4 kg

Female

27.2–36.3 kg

Breed club figure (the American Kennel Club)

Weight for age

Stock data

Male

Female

Expected range

Expected range from the breed's own adult weight, kilograms. Growth reference: Salt et al. 2017, WALTHAM (30–40 kg band).

Heat cycles · females

Stock data

First heat

8–12 mo

typical

Interval

180 d

typical

Bleeding

~9 d

typical

Proestrus 9d

Estrus 9d

Diestrus 52d

Anestrus 110d

General figures for dogs, not for this breed — individual cycles vary widely.

Questions people ask

Adult males usually weigh 34–45.4 kg and females 27.2–36.3 kg. Most are close to their full size by around 16 months, though the last little bit of filling out takes longer. Growth reference: Salt et al. 2017, WALTHAM (30–40 kg band).

No American Bulldog cycle figures are published here yet, so this is general guidance rather than a breed number: most females have a first season somewhere between six and fifteen months, and cycles then settle to roughly every 180 days. Smaller breeds tend to start earlier and larger ones later.

10–15 y — the usual range. Wikidata (CC0) · no measured cohort for this breed. How the later years go comes down to weight, teeth, exercise and regular check-ups far more than to the breed.