I have a 13-year-old Border, Tammy. I have had her since she was 9 months old. For me, I think they are one of the best of the terrier breeds as they are not too aggressive or barky. Tammy doesn't bark much but loves to patrol the fence line (we live in a rural area), and has lived quite happily with our past dogs (Bull Terrier and Labrador) and now with our 2 Cavaliers. She will however tolerate some dogs, and have a snap at others - there's just no way of knowing which ones she will like and which ones not. She has never had any health problems and is still fit (although sleeps a bit more these days). She always liked a pat, but was never really a lap dog until the last few years. She has always been a bit timid, but I don't think that is typical of the breed. She did chew things for about the first 10 years of her life - hehehe, many's the chewed up things I hid from my son and never told him about. I think they are great dogs, with the typical terrier spirit, but not excessively so.