Hi I know a couple of ppl with border terriers. They are lovely! Very freindly and affectionate. Easily trained and have a fab personality. my freinds one dances for treats. so cute. Very easy and small. Good all round family dogs I have to say but just remember no dog can be trusted 100% so be careful where your friend gets the border terrier from.
I have a friend with one - she says they are very sweet & good with the family, but can be very excitable esp. with people they don't know - may run around barking.
Biggest advantage - they are very portable! - so if they get excited you can just pick them up & tuck them under your arm!
BIL has one. Great with older kids. Buggers for running off and sniffing out small wild creatures.
BIL's has a penchant for hedgehogs - came home one day with blood all over face and a snout full of spikes.