X was born in Bristol in Gloucester, England in 1884 and so named because of his tendency to nip the backs of visitors' legs. When his first master Mark Barraud died destitute in Bristol in 1887, X was taken to Liverpool in Lancashire, England by Mark's younger brother Francis, a painter.
In Liverpool X discovered the Phonograph, a cylinder recording and playing machine and Francis Barraud "often noticed how puzzled he was to make out where the voice came from". This scene must have been indelibly printed in Barraud's brain, for it was three years after X died that he committed it to canvas.
X died in September 1895, having returned from Liverpool to live with Mark Barraud's widow in Kingston-upon-Thames in Surrey, England. Though not a thoroughbred, X had plenty of bull terrier in him; he never hesitated to take on another dog in a fight, loved chasing rats and had a fondness for the pheasants in Richmond Park!
In 1898 Barraud completed the painting and registered it on 11 February 1899. This painting is very famous.
Questions: (1) Name X (2) Why is the painting famous i.e. where can you find it today?
Update, The correct answers are (1) Nipper, (2) the HMV Logo. More info here. The info in the question was from here.