How to Tell If a Dog Is an Adult

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You can tell by body size, teeth, behavior and breeding ability. Small breeds are adults around 1 year; large breeds need about 1.5 years.

Dogs start teething at 3-5 months and finish by 1 year, so full adult teeth mean adulthood.

They usually show heat at 6-8 months; by the second heat they are essentially adults.

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