PET owners fear their animals are being made ill by a harmful weedkiller.
Scott Andrews, of Wilkinson Terrace, Ryhope, claims cats and dogs are suffering from sickness and diarrhoea as a result of a substance sprayed in the area by Sunderland City Council.
But council chiefs have denied the treatment can cause harm to animals.
Mr Andrews said he had contacted the council after his Alsatian dog Sam became ill, and he discovered other pet owners in the area had had similar problems.
“We’re obviously very concerned about this,” said Mr Andrews. “The advice was to keep my dog away from the areas that had been sprayed, and stop it from sniffing – but how can you stop a dog from sniffing?”
He added: “My dog has been very ill. It also costs about £75 a time to take my dog to the vet.”
Mr Andrews said he had read information about the substance and claimed it could harm pets if mixed with water.
He said: “It’s supposed to be kept dry for six hours afterwards, but how can you make sure it doesn’t rain?”
The council has told pet owners that the weedkiller used is not poisonous to their animals.
Les Clark, head of Street Scene at Sunderland City Council, said: “The chemicals we use to treat weeds in Sunderland are non-toxic to mammals, including cats and dogs.”