Seen 2 litters last couple years die parvo at 6 weeks just before they were to be jabbed 2 summer ago there was lota parvo about vet said. Guy burnt kennels got real good disinfectant for hospitals 7 months later put his 3 year old bitch in same block she came down with parvo died with in 48 hours. She was jabed as a pup got booster at 12 months but missed nxt 2 boosters. My view if you rate ur dogs get them boostered each year. Jab a pup from 8 weeks.