Vet Services Wairarapa have been handling cases of parvovirius in dogs since mid-January in Wairarapa, a trend for this time of year, according to vet Stuart Bruere.
Parvo virus is a severe viral infection in dogs that causes depression and a sudden onset of vomiting and bloody diarrhoea.
In most cases, untreated dogs will die.
"We've seen eight positive cases since January," he said.
Mr Bruere said if owners are bringing in dogs to their vet, it is better to call the clinic first, and leave the dogs in the car first rather than walk them into the clinic.