Newfoundland Growth Chart: Puppy Weight by Month

Newfoundland puppy weight chart (lb)

Adult weight	2 mo	3 mo	4 mo	5 mo	6 mo	8 mo	10 mo	12 mo	15 mo	18 mo
Male, 130 lb	17	29	43	56	68	86	102	112	122	127
Male, 150 lb	20	34	50	65	78	100	117	129	141	147
Female, 100 lb	13	22	33	43	52	66	78	86	94	98
Female, 120 lb	16	27	40	52	62	80	94	103	113	118

Newfoundland puppy weight chart (kg)

Adult weight	2 mo	3 mo	4 mo	5 mo	6 mo	8 mo	10 mo	12 mo	15 mo	18 mo
Male, 59 kg	7.9	13	20	26	31	39	46	51	55	58
Male, 68 kg	9.1	15	23	29	35	45	53	59	64	67
Female, 45 kg	6.0	10	15	20	24	30	36	39	43	44
Female, 54 kg	7.3	12	18	24	28	36	43	47	51	53

Typical weights by month. Individual puppies often sit 10–15% above or below these numbers. Last reviewed October 7, 2026.

How big does a Newfoundland get?

According to the American Kennel Club's breed profile for the Newfoundland, adults weigh: male 130–150 lb; female 100–120 lb. Life expectancy is 9–10 years.

	Weight	Height
Male	130–150 lb	28 in (average)
Female	100–120 lb	26 in (average)

When does a Newfoundland stop growing?

Newfoundlands grow like other giant-sized dogs: they are close to adult weight at around 18 months. At 6 months a typical Newfoundland puppy has reached about 52% of its adult weight.

To estimate your own puppy's adult weight from its current weight and age, use the puppy weight calculator and choose "Giant" as the expected adult size.

How the chart is made

The adult weights come from the AKC breed profile. The weight at each month is estimated with our giant-breed growth curve, which gives the share of adult weight a typical puppy of that size reaches at each age. The curves are simplified from published research on dog growth, including the growth standard charts by Salt and colleagues (PLOS ONE, 2017).

If your puppy is well below or above the chart, stops gaining weight, or looks very thin or round, ask your vet to check its body condition.

Questions people ask

How much should a 3-month-old Newfoundland weigh?

Typically about 22–34 lb, depending on sex and how big the dog will be as an adult.

How much should a 6-month-old Newfoundland weigh?

Typically about 52–78 lb, roughly 52% of adult weight.

When is a Newfoundland full grown?

Most Newfoundlands are close to their adult weight at around 18 months, though many keep filling out with muscle for a while after that.

How big will my Newfoundland get?

The AKC lists adult weights of male 130–150 lb; female 100–120 lb. Your puppy's parents are a good guide to where in that range it will end up.

Newfoundland growth chart