Position statement on vaccination and socialization by the American Veterinary Society of Animal Behavior 2019

Conclusions:

• Behavioral issues, not infectious diseases, are the number one cause of death for dogs under three years of age.
• A dog's first 3 months are the most critical for socialization.
• Puppies can start puppy class as early as 7-8 weeks, provided that they have had at least one set of vaccines, at least a week before the start of class.

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