When are Australian Terriers fully grown?

Australian Terriers are fully grown by 12 months of age. They typically reach their full height by six to eight months old and continue to fill out until their first birthday. Various factors, including genetics, nutrition, and overall health, influence an Australian Terrier’s adult size. 

Adequate nutrition is especially crucial during the puppy stage to support healthy growth and development. Puppy food is formulated to meet the higher nutritional needs of growing dogs, with more calories, protein, and certain nutrients like calcium. As growth slows, the caloric and nutritional density of puppy food becomes unnecessary and can lead to excessive weight gain if continued for too long. You can begin transitioning your Australian Terrier to adult food at around eight months old.