there no such thing but this is the sort of thing(wanker)that people call minature jack russell.Russell x chichuchua
That is very like JR Yipps stuff, he has spent the last couple of years breeding them ever smaller (I know the chiwawa stud dog he bought cost him over £1500) but he says they can fair rattle around earths, which is exactly what he wants when time is of the essence.......I must say, his results speake for themselves.
MOO had one off him last year, and he is made up with his.