At What Age Are West Highland White Terriers Done Growing?

i have a four month old westie puppy, he is growing so fast! we are wondering at what age will he be down GROWING? i know they fill out later and gain more muscle mass, but i am just asking about length and height. As of now he weights about 8 pounds he has larger ears than most westies and a longer tounge haha.. he is a purebreed westie tho, do u think having larger ears indicates that he will be a bigger westie at maturatety?

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