Dog Size Calculator

How to predict your puppy's adult size

Predicting a puppy's adult weight is based on their current weight, age, and expected breed size. Different sized breeds grow at different rates and reach maturity at different ages.

Growth patterns by breed size

Simple estimation methods

Double the weight at 4 months

For medium-sized breeds, doubling the weight at 16 weeks gives a rough estimate of adult weight.

Adult weight = Current weight ÷ Growth percentage

This calculator uses growth charts to determine what percentage of their adult weight a puppy has reached at different ages.

Factors affecting adult size

• Genetics: The most important factor
• Gender: Males are typically 10-20% larger than females
• Nutrition: Proper nutrition supports healthy growth
• Health: Illness can affect growth
• Spay/neuter timing: May slightly affect final size

When is a dog fully grown?

• Toy breeds: 6-8 months for height, 8-10 months for weight
• Small breeds: 8-10 months for height, 10-12 months for weight
• Medium breeds: 10-12 months for height, 12-14 months for weight
• Large breeds: 12-16 months for height, 14-18 months for weight
• Giant breeds: 16-18 months for height, 18-24 months for weight

Tips for healthy growth

1. Feed age-appropriate puppy food
2. Don't overfeed (rapid growth can stress joints)
3. Large breed puppies need specific large-breed puppy food
4. Regular vet checkups to monitor growth
5. Avoid excessive exercise until growth plates close