Your nine month old golden retriever is 22.4 inches highWill he grow a bit more in height?

Yes, your golden retriever will likely grow a bit more in height. Most golden retrievers reach their full adult height between 12 and 18 months of age, so your dog still has a few months of growing to do. On average, male golden retrievers grow to be between 23 and 24 inches tall at the shoulder, while female golden retrievers grow to be between 21 and 23 inches tall at the shoulder. However, some golden retrievers may be slightly taller or shorter than these averages.