A YORKSHIRE Terrier was killed by a Rottweiler at Newmillerdam.
Denis and Janet Lockwood took their little dog, Sam, for a walk around the country park on Saturday afternoon.
While they were there Sam was bitten by a dark-coloured Rottweiler and later died.
Officers from the Rural neighbourhood police team have launched an investigation.
Insp Richard Clare said: “We are aware of this incident and have spoken at length with the involved parties including the owner of the deceased dog who is understandably very upset by what has taken place.
“Enquiries are ongoing and we are working with our partners in Wakefield Council to investigate this incident.
“I would ask anyone who was in the park at the time and saw this incident between these animals or saw both dogs shortly beforehand to contact us.”
The incident happened at around 4.30pm in front of several families.
Glynn Humphries, Wakefield Council’s service director for Cleaner and Greener, said: “We are aware of this upsetting incident and taking it very seriously, working with the police to try and establish what happened on Saturday afternoon.
“Newmillerdam is a popular dog-walking location. We want people to use the park with confidence and we always urge all dog owners to act responsibly in all our parks and open spaces.”
Mr Lockwood, 46, of Flanshaw said he and his wife were devastated by Sam’s death.
He said: “The police and the council are dealing with the incident will do whatever they think is necessary.
“We would like to thank everyone for their help and support.”
Witnesses should call police on 101 or call Crimestoppers anonymously on 0800 555111.