Don't know an awful lot about dogs Eric, but watch the other animals.
My friend had one and killed next door neighbours cat, and she had him put down as the vet said once they had done this would be no stopping them. Funnily enough his name was Eric ..
Next door to me they have one (though living with the neighbour's mother now). I loved him to bits, however, if he spotted my cat all hell would break loose .. J.R. (yes that is his name !) always came off worse though.
Couple of years ago, my cat disappeared whilst I was on holiday and know that the dog had come to my neighbours for a couple of weeks .. always wondered if he had got my cat in the end.
They are a lovely little dog though.