Rheumatoid arthritis (RA) is an autoimmune disease with symptoms that vary from person to person and may include joint pain, swelling and stiffness.
Health Problems & Life Expectancy. The typical West Highland Terrier lives about 12-16 years. Of course, individual dogs can have a life span outside that range based on care and pure luck. Like all dog breeds, Westies are prone to certain diseases, disorders, and behavioral problems.
Report Abuse. I also have a 15 month old Westie and she was fully grown around 12 months. She may have been full grown by 9 months, but her hair was still growing so it may have looked like she was growing bigger :).Amiee W Â· 8 years ago.lthough they usually reach close to their maximum height/weight in small breeds by 1 year, they aren't consider fully mature until 2 years old. Large breeds can be a great deal older than that before they are considered mature. stulisa42 Â· 8 years ago.