SPRINGFIELD, Mass. - Parvovirus cases are popping up in Springfield, causing concern for pet owners. At least seven cases have been confirmed in the city in the last month.

The virus primarily affects young or unvaccinated dogs and spreads through direct dog-to-dog contact and contact with contaminated feces, objects and surfaces.

Second Chance Animal Services has a veterinary hospital in Springfield. CEO Sheryl Blancato said they've held several vaccination clinics in the last few weeks, vaccinating more than 100 animals at a time. They've gone into neighborhoods to reach more community members.

"It's very important for people to understand you need to get your dog vaccinated for parvo because it last for months, years outside," Blancato said. "You can bring it in on your shoes. Saying your pet never leaves the yard its not a safety net for those animals."

Blancato said the main symptoms are vomiting, diarrhea, not eating and fatigue. She said if your dog is showing signs of parvo, bring them to the vet right away. How quickly they receive care could determine whether or not they survive the infection.