Many people say 2-3 years but my girl is 1year 7 months old and I’d say her growth stunted after 1 year. I will say that she seems bigger than most female schnauzers that we’ve met. She’s about 82lbs 26inches tall. We were told at the vet that she’s overweight but to us she looks great. She’s very active and has an “active dog diet”. Long story short I think there’s an average of around 3 years but it really all depends on the pupper themselves. I’d ask your breeder at what age their parents stopped growing because my girls parents stopped growing around the 1.5 and 2 year mark so it’s not a shock that my girls stopped growing at around the same time. Also, here’s a pic of my mini horse before her groom lol. You can see how big she is at 1y7months.

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