How big does a Bolognese get?

Adult Bolognese — Photo — Grace, CC BY 2.0 · Wikimedia Commons

A full-grown Bolognese is a small dog, weighing about 6–9 lb as an adult.

Adult weight: 6–9 lb
Also in kilograms: 2.5–4 kg
Size class: Small

As a small breed, a Bolognese reaches its adult weight earlier than a large dog — smaller breeds finish growing sooner (Hawthorne et al., 2004).

Compare every breed’s adult weight·Your dog’s age in human years

Weight varies within the Bolognese by sex, genetics and health, and mixed-breed dogs fall between their parents. This is a typical range, not a guarantee.

Verified on July 28, 2026. Based on Wikidata — dog breed mass (property P2067) (Wikimedia Foundation, query run 2026-07-22, CC0 license), Wikidata — cat breed mass (property P2067) (Wikimedia Foundation, query run 2026-07-28, CC0 license) and Body-Weight Changes during Growth in Puppies of Different Breeds (Hawthorne et al., Journal of Nutrition, 2004, vol. 134, p. 2027S). See the method.