before your puppy is fully immunized at around fifteen to sixteen weeks, you want to minimize his exposure to pathogens like parvo virus. But the first and most important period of socialization is over around week twelve or thirteen, so you need to balance the medical risks with the behavioral risks of keeping your puppy isolated until the sensitive period of socialization is over. Regrettably these two risks create a conflict. Many owners solve this dilemma by ensuring that their pup meets lots of new people at home and goes to lots of safe new places (like the neighbor’s fenced backyard)
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