Cocker Spaniel puppies grow toward an adult weight of 24.9–30.0 lb (11.3–13.6 kg) (males) and 20.1–24.9 lb (9.1–11.3 kg) (females) under the American Kennel Club standard; the chart below gives the healthy range at each month, by sex.
Quick answers
- Adults weigh 24.9–30.0 lb (11.3–13.6 kg) (males) and 20.1–24.9 lb (9.1–11.3 kg) (females) under the AKC standard.
- At 6 months a male is usually 19.0–22.7 lb and a female 14.8–18.5 lb — about 76% of adult weight.
- At 12 months a Cocker Spaniel is around 92% of its final weight.
- Fully grown at roughly 15 months.
Cocker Spaniel weight chart by age
| Age | Male | Female | % of adult |
|---|---|---|---|
| 2 months | 6.8–8.2 lb3.1–3.7 kg | 5.7–7.1 lb2.6–3.2 kg | 27% |
| 3 months | 10.6–12.8 lb4.8–5.8 kg | 8.8–10.8 lb4.0–4.9 kg | 42% |
| 4 months | 13.9–16.8 lb6.3–7.6 kg | 11.2–14.1 lb5.1–6.4 kg | 56% |
| 5 months | 16.8–20.3 lb7.6–9.2 kg | 13.4–16.5 lb6.1–7.5 kg | 68% |
| 6 months | 19.0–22.7 lb8.6–10.3 kg | 14.8–18.5 lb6.7–8.4 kg | 76% |
| 8 months | 21.6–26.0 lb9.8–11.8 kg | 17.0–21.2 lb7.7–9.6 kg | 86% |
| 10 months | 22.9–27.6 lb10.4–12.5 kg | 18.1–22.5 lb8.2–10.2 kg | 92% |
| 12 months | 22.9–27.8 lb10.4–12.6 kg | 18.3–22.7 lb8.3–10.3 kg | 92% |
| 18 months | 24.5–29.5 lb11.1–13.4 kg | 19.4–24.3 lb8.8–11.0 kg | 98% |
| 24 months | 24.9–30.0 lb11.3–13.6 kg | 20.1–24.9 lb9.1–11.3 kg | 100% |
Weigh on the same scale at the same time of day where you can. The trend across several weighings tells you far more than any single row.
Reading the range
The American Kennel Club gives separate ranges for the sexes, 25 to 30 lb for males and 20 to 25 lb for females, so the two columns above diverge from the first row.
The Cocker Spaniel sits at the boundary between the small and medium size classes on this site; the midpoint of its adult range across both sexes is 11.4 kg, just over the 11 kg line, so it uses the medium-class curve. A dog at the light end of the female range will match the small-class chart almost as well.
How a medium breed grows
Cocker Spaniels reach roughly 27% of adult weight at 2 months, about 56% at 4 months, and around 92% at 12 months.
The last stretch is slow: from 12 months to full size takes about as long again as the first year’s final quarter. A Cocker Spaniel that looks lanky at 10 months is usually on schedule rather than behind.
Where to go next
- Estimate your own puppyEnter an age and weight to project this breed’s adult size.
- Compare across medium breedsThe same curve applied to every medium breed on the site.
- Puppy growth chart by ageAll five size classes in one table, and what the ranges mean.
- Body condition scoreThe 9-point scale vets use, and why it beats the scale alone.
Other medium breeds
Frequently asked questions
What is the average weight of a Cocker Spaniel?
An adult male Cocker Spaniel weighs 24.9–30.0 lb (11.3–13.6 kg) and an adult female 20.1–24.9 lb (9.1–11.3 kg), according to the American Kennel Club breed standard.
How much should a 3 month old Cocker Spaniel weigh?
A male is typically 10.6–12.8 lb (4.8–5.8 kg) and a female 8.8–10.8 lb (4.0–4.9 kg) — around 42% of adult weight.
How much should a 4 month old Cocker Spaniel weigh?
Roughly 13.9–16.8 lb for a male and 11.2–14.1 lb for a female, about 56% of the way to adult weight.
How much does a 6 month old Cocker Spaniel weigh?
A male is usually 19.0–22.7 lb (8.6–10.3 kg) and a female 14.8–18.5 lb (6.7–8.4 kg).
How much does a 12 month old Cocker Spaniel weigh?
22.9–27.8 lb for males and 18.3–22.7 lb for females — about 92% of final weight, with the rest filling in over the following months.
How big will my Cocker Spaniel get?
At 56% of adult weight by 4 months, a rough shortcut is to double a four-month weight. The calculator on the home page does this properly, using the growth curve for this size class and returning a range rather than one number.
When is a Cocker Spaniel fully grown?
Height is usually settled first; weight keeps filling in until around 15 months. The last 8% of adult weight takes roughly as long as the jump from 3 to 4 months.
Do male and female Cocker Spaniels weigh different amounts?
Yes, and by enough to matter. Adult males run 24.9–30.0 lb (11.3–13.6 kg) against 20.1–24.9 lb (9.1–11.3 kg) for females. Comparing a female against a chart that does not separate the sexes will usually make her look underweight when she is not.
What size class is a Cocker Spaniel?
A medium breed, defined by adult weight. That classification determines the growth curve used here: veterinary research shows dogs of similar adult size grow at similar rates regardless of breed.
Is my Cocker Spaniel puppy underweight if it is below the chart?
Not necessarily. The table shows the middle of the healthy range, so plenty of healthy puppies sit below it. A puppy that is consistently below and not gaining, or that has dropped from a higher line to a lower one, is worth a vet visit. A single reading below the range is not.
How can I tell if my Cocker Spaniel is a healthy weight?
Body condition tells you more than the scale. You should be able to feel the ribs under a thin layer of fat without pressing, see a waist from above, and see the belly tuck up from the side. A dog can sit inside the weight range and still carry too much fat.
Why do Cocker Spaniel growth charts disagree with each other?
Most published charts come from one breeder’s litters or from unsourced rules of thumb, and many do not say whether the figures are for males, females or both. The ranges here come from centile curves fitted to millions of veterinary bodyweight records, scaled to the AKC adult range, and split by sex.
Does neutering change how much a Cocker Spaniel weighs?
The research behind these curves found neutering shifted growth trajectory only slightly, by less than the variation between individual dogs, so separate curves were not needed. Neutering is associated with a higher chance of becoming overweight in adulthood, which is a body condition question rather than a growth chart one.
Where these numbers come from
Adult weights are the breed standard figures published by the American Kennel Club. The month-by-month ranges are estimates rather than measurements of this breed: they come from growth centile curves built from around 15 million bodyweight records collected at US primary-care veterinary hospitals, published open-access by Salt and colleagues, and scaled to the adult range above. That research found dogs of similar adult size grow at similar rates regardless of breed, which is what makes the scaling valid. The records were collected between 1994 and 2013 and describe dogs attending veterinary clinics rather than an idealised population. The derived table, the filtering steps and the known gaps are all published, so the arithmetic here can be checked rather than taken on trust.
- American Kennel Club — Cocker Spaniel breed standard
- American Spaniel Club — the AKC parent club for the breed
- American Kennel Club — English Cocker Spaniel breed standard, for comparison
- Engdahl KS, Brodbelt DC, Cameron C, Church DB, Hedhammar Å, O’Neill DG (2023). Demography and disorders of English Cocker Spaniels under primary veterinary care in the UK. Canine Medicine and Genetics 10:4
- Salt C, Morris PJ, Wilson D, Lund EM, German AJ (2017). Growth standard charts for monitoring bodyweight in dogs of different sizes. PLoS ONE 12(9): e0182064
- Supporting dataset, University of Liverpool DataCat (CC BY 4.0)