police are hunting the owner of a ` staffy-type ' dog after a four-year-old girl suffered bite wounds to the face .
the child was outside shops with her older sister in brighton , east sussex , when the dog attacked her .
sussex police say the dog was off the lead with two similar dogs - two were black and one was white .
they were with a man described as being in his 50s , with purple hair and a brown moustache .