Mrs Mosier, who is originally from Canada, reported the attack on her own dog last September to police and the local authority’s dog control. Officers investigated but have not been able to trace the owner.
She added: “I couldn’t get justice for my little dog and now somebody else’s dog has been killed.
“Justice was not served and vicious animals continue in our parks, attacking humans and killing smaller dogs. One of these times it will be a child attacked instead of a smaller dog.
“This is a growing problem and I would like see our parks safe once again.”