Use this Rat Terrier puppy weight calculator to predict how big your puppy will get. Rat Terriers are a terrier breed that typically reach full size by around 12 months.
Enter your puppy's current weight and age to predict their adult size
Estimates based on breed growth curves. Individual dogs vary with genetics and nutrition — check with your vet for a personalized read.
Indoor/outdoor enclosure — a good fit for toy and small breeds.
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
| Age | Weight |
|---|---|
| Birth | 0.2 to 1 lbs |
| 2 Months | 3 to 8 lbs |
| 3 Months | 4 to 10 lbs |
| 4 Months | 5 to 13 lbs |
| 5 Months | 6 to 15 lbs |
| 6 Months | 7 to 18 lbs |
| 7 Months | 8 to 20 lbs |
| 9 Months | 9 to 23 lbs |
| 10 Months | 10 to 25 lbs |
| 1 Year | 10 to 25 lbs |
| 1.5 Years | 10 to 25 lbs |
| 2 Years | 10 to 25 lbs |
Estimated from typical toy-breed growth curves and the Rat Terrier's adult weight range. Individual puppies vary — use the calculator above for a prediction based on your puppy's actual current weight.
New breed data, growth tips, and puppy-parenting insights, plus our free printable puppy growth tracker.
Prone to patellar luxation, hereditary cardiac issues, and a rare demyelinative neuropathy documented in the breed; otherwise generally healthy and long-lived.
A quality diet in measured portions matched to this breed's genuinely active nature.
The short coat needs minimal brushing.
Intelligent and trainable, Rat Terriers need real daily exercise and mental engagement to stay content.
An American farm dog developed for ratting and small-game hunting, once a common sight on family farms nationwide.
Energetic and intelligent, Rat Terriers combine genuine hunting instinct with an affectionate, people-oriented temperament.
