When is a Norwich Terrier fully grown?

Norwich Terriers are fully grown at about 12 months old. They typically reach their full height by eight months and then continue to fill out and develop muscle mass until their first birthday. To help them grow healthy and strong, it’s important to provide them with a small-breed, balanced diet suited to their age, support their development with moderate exercise without overloading their growing bones, and schedule routine checkups to catch and treat any health issues early on.