When do Kerry Blue Terriers stop growing?

Kerry Blue Terriers stop growing in height by around 10 to 12 months old, but they can continue to fill out and gain muscle until the 18-month mark. 

You can switch these spirited pups over to adult food once they reach around 10 to 12 months old, as their growth will start to slow down, and they’ll need a diet that supports maintenance rather than rapid development. Just make sure to transition gradually to avoid any digestive issues.