Puppy food is built for growth — richer in protein, calories, calcium and fat. Feed it too long and your dog gains excess weight; switch too early and you cut short their development. Here's exactly when and how to make the change.
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Open the free feeding calculator →Why puppy food is different
Puppy formulas pack more calories and protein plus balanced calcium and phosphorus for bone growth. A growing puppy simply can't get enough from adult food. That's why the switch is all about timing — not doing it before growth is mostly done.
The right age to switch — by size
Growth finishes at different ages depending on breed size:
- Small breeds (up to 10 kg): around 9-12 months
- Medium breeds (10-25 kg): around 12 months
- Large & giant breeds (25 kg+): 12-18 months
A good rule: switch when your puppy reaches about 80-90% of expected adult weight.
How to transition safely (7-10 days)
Never swap in one day — it upsets the stomach. Mix gradually over a week:
- Days 1-3: 75% puppy + 25% adult
- Days 4-6: 50/50
- Days 7-9: 25% puppy + 75% adult
- Day 10: 100% adult
If you see loose stools, slow the pace down.
What to look for in adult food
Choose a complete adult food with a named meat as the first ingredient, sized for your dog's breed. After the switch, portions drop — adult dogs need fewer calories per kg than puppies, so re-check the amount.
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What happens if I switch too early?
You may cut short bone and muscle development, especially in large breeds. If in doubt, wait a little longer rather than switching too soon.
Do small and large breeds switch at the same age?
No. Small breeds mature by ~9-12 months, while large and giant breeds keep growing until 12-18 months.
How do I know it's time?
When your puppy reaches about 80-90% of adult weight and growth has slowed. Your vet can confirm based on breed and body condition.