Cairn Terrier weight chart by age
In a published growth study, adult Cairn Terrier dogs averaged about 14 lb (6.3 kg). Puppies reached 99 percent of that weight at around 43 weeks, which is about 10 months. Use the chart to see what is typical at each age, or enter your puppy's weight for an estimate of the adult size.
Your puppy is at about 52% of its adult weight.
Cairn Terrier puppy weight by age
| Age | Pounds | Kilograms | Of adult weight |
|---|---|---|---|
| 8 weeks | 3.1 | 1.4 | 22% |
| 12 weeks | 4.9 | 2.2 | 36% |
| 16 weeks | 7.2 | 3.3 | 52% |
| 20 weeks | 9.5 | 4.3 | 68% |
| 24 weeks | 11.2 | 5.1 | 81% |
| 32 weeks | 13.1 | 5.9 | 94% |
| 40 weeks | 13.7 | 6.2 | 98% |
| 1 year | 13.9 | 6.3 | 100% |
| 15 months | 13.9 | 6.3 | 100% |
| 18 months | 13.9 | 6.3 | 100% |
| Adult average | 13.9 | 6.3 | 100% |
Values are calculated from the growth curve fitted to the Cairn Terrier puppies in the study. Males and females were not reported separately here, and individual dogs vary, so treat the numbers as a typical pattern, not a standard.
Cairn Terrier growth chart
The dot marks one year. After that, weight changes slowly.
How fast does a Cairn Terrier grow?
This breed is in the small group in our puppy size calculator. Growth was half done at about 16 weeks, which is when the curve is steepest. A Cairn Terrier is usually close to its adult weight by 10 months, although the body can keep filling out afterward. For how much to feed along the way, see the puppy feeding chart.
Questions
How much should a Cairn Terrier puppy weigh at 8 weeks?
In the study a Cairn Terrier weighed about 3.1 lb (1.4 kg) at 8 weeks.
How much should a Cairn Terrier puppy weigh at 16 weeks?
About 7.2 lb (3.3 kg), which is roughly 52 percent of the adult weight.
How much does an adult Cairn Terrier weigh?
The adult dogs in the study averaged about 14 lb (6.3 kg). Breed standards and individual dogs differ.
When is a Cairn Terrier fully grown?
Around 43 weeks (10 months) for weight, according to the growth curve.
Is my Cairn Terrier overweight?
Weight alone cannot say. Use the body condition check to look at ribs and waist.
Other breeds
Papillon, Cocker Spaniel, Miniature Schnauzer, Beagle, English Springer Spaniel, Labrador Retriever, English Mastiff, St. Bernard, Irish Wolfhound, Great Dane, Newfoundland. See also the dog weight chart for all breeds side by side.
Sources
- Hawthorne A.J. et al., "Body-weight changes during growth in puppies of different breeds", Journal of Nutrition, 2004.
Last reviewed 2026-10-26. This page is general information and not veterinary advice.