If a Chihuahua does not grow in size - either width or height - for 4 weeks, it is suggested to bring him or her in for a checkup. 1 Year to 18 Months - This breed finishes growing to its adult size between the 1 year and 18 month mark. About the Chihuahua The Chihuahua is a balanced, graceful dog of terrier-like demeanor, weighing no more than 6 pounds. The rounded “apple” head is Temperament: Charming, Graceful, Sassy.
Despite the Chihuahua's small size, like all dogs he needs exercise and training. The amount of energy an adult Chihuahua has can be surprising. The amount of energy an adult Chihuahua . Dec 22, · 6 to 9 Months: Growth begins to slow down, with most Chihuahuas reaching their adult height of approximately to inches within 9 months. Your Chihuahua may still "fill out," but he shouldn't gain any significant amount of weight beyond this point.