The causes and correction methods for puppy biting vary depending on the dog's age. We've outlined the essential correction points for each stage from 2 to 8 months that you shouldn't miss.

| Item | 2–3 Months (Milk Teeth Stage) | 4–6 Months (Teething Stage) | 7–8 Months (Late Socialization) |
|---|---|---|---|
| Main Cause | Exploration and curiosity | Gum itching and pain | Play and attention-seeking |
| Biting Pattern | Generally tends to bite gently | Increased biting frequency due to teething | May bite hard when excited |
| Key Correction Method | Bite inhibition (learning force control) | Provide cold toys | Stop play and time-out |
| Reactions to Avoid | Shouting loudly | Pushing away with hands | Physical punishment and excited reactions |
Ages are averages and vary by individual. Medically, nipping due to teething is usually prominent at 3–7 months of age, and biting intensity depends more on the individual and situation (level of excitement) than on age

Never Do These Things
Physical punishment, hitting the snout, or forcibly closing the mouth can actually worsen biting behavior. According to veterinary behavior textbooks, aversive techniques (such as physical punishment and coercion) increase a dog’s fear, anxiety, and stress levels and are less effective than positive reinforcement-based training. Repeated physical punishment carries the risk of escalating into fear-based aggression. Additionally, pulling your hand away abruptly or screaming loudly when the dog bites can stimulate excitement and reinforce the biting behavior, so calm and consistent responses are most important.

When to Consult a Vet
Consider consulting a veterinary behaviorist in the following situations: ① when your pet bites hard enough to draw blood and refuses to let go; ② when they growl and bite around food or toys (resource guarding aggression); or ③ if they have not learned bite inhibition by six months of age. These signs may indicate aggression beyond simple mouthing, making early intervention crucial.

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.
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[1] Horwitz D., Mills D., BSAVA Manual of Canine and Feline Behavioural Medicine, 2nd Ed, Chapter: Puppy Development and Socialization
[2] Landsberg G. et al., Handbook of Behavior Problems of the Dog and Cat, 3rd Ed, Chapter: Aggression - Classification and Overview
[3] Overall K., Manual of Clinical Behavioral Medicine for Dogs and Cats, Chapter: Normal Canine Behavior and Ontogeny