She will not be protected against the diseases that dogs are vaccinated for yearly. If she comes into contact with any of these viruses, she will not be protected and will get The expense of treating or trying to treat the disease will out weigh what it would have cost to protect her with vaccines. Some of the diseases are truly a horrible death . Many of the diseases can be contracted be stepping in infected feces of a dog with parvo. Or stepping in urine or sniffing urine from a raccoon.Do you ave garbage cans that are visited by raccoons? Or even from the ground that has been infected with distemper.Anywhere you walk your dog may be a potential hazard for picking up many viruses and parasites and bacterias.