A mum was attacked by a dog while walking with her two children and pet dog in Kettering.
The attack happened in High Street, close to McDonalds, at about 4.45pm on Sunday, April 9.
A police spokesman said: “The offender’s dog, which was off its lead, gripped the victim’s dog around the neck and when removed it then scratched and pushed at the woman’s leg causing a large scratch and bruising.”
The dog owner was described as white, aged about 30, 6ft with a stocky build.
He has a large ginger dog called Monty.
Anyone with information about the incident can call Northamptonshire Police on 101 or Crimestoppers on 0800 555111.