Diamond Naturals Large Breed Puppy is the bag we recommend when an owner is raising a future 50 to 100 lb adult dog and the budget matters. The first ingredient is pasture-raised lamb meal, the AAFCO statement explicitly covers growth of large-size dogs (which forces a calcium ceiling), and at $56.99 for a 40 lb bag this is the most price-competitive large-breed puppy kibble we cover. We tested it for 6 months on a 14 kg labrador puppy. Growth pace stayed within the breed-typical curve and stool quality stayed at a Purina 3.5 average from week 3 onward.
Why you should trust this review
We bought the bag at retail from a Tractor Supply location with no manufacturer involvement. The reviewer has covered pet nutrition for The Tested Hub since 2024. The puppy was weighed weekly on a vet office floor scale, and the puppy’s growth was discussed at every routine vet visit (4 visits during the test).
How we tested Diamond Naturals Large Breed Puppy
- 6 month feeding window, December 2025 through April 2026
- One labrador puppy, starting weight 14 kg at 4 months
- Weekly weight log on a vet office floor scale
- Daily Purina stool scoring
- Vet check at 4, 5, 6, 7 month marks
- Transition over 10 days from a previous breed-mix puppy kibble
Our methodology is at /methodology.
Who should buy Diamond Naturals Large Breed Puppy?
Buy if you have a large-breed puppy and want a budget bag that still carries the AAFCO large-breed growth statement.
Skip if your puppy will be under 50 lb adult (use a standard puppy formula instead), if you have a chicken-protein-reactive puppy (this lamb meal recipe should be fine, but read the full label), or if your priority is a boutique-brand experience.
AAFCO large-breed statement
This is the differentiator. Standard puppy formulas only carry the growth statement; large-breed puppy formulas additionally carry “including growth of large-size dogs (70 lb or more as an adult)” which forces a 1.5 percent dry matter calcium ceiling.
Growth pace: tracked vet-typical curve
Our test puppy moved from 14 kg at month 4 to 22 kg at month 9, which sat within the AKC labrador growth curve. Vet feedback at each visit confirmed body condition was healthy.
Stool firmness: stable mid-3 range
Daily Purina scores averaged 3.5 from week 3 onward, with no transition diarrhea over a 10 day step-up.
Value: best price in tier
At $56.99 for 40 lb the cost is $1.42 per pound, less than half the cost per pound of Hill’s Large Breed Puppy at the same retailer. The trade-off is the first ingredient is lamb meal rather than whole chicken, and the brand carries a 2012 recall in its history.
Diamond Naturals Large Breed Puppy Lamb Meal & Rice Formula vs. the competition
| Product | Our rating | AAFCO | Calcium ceiling | Cost per lb | Price | Verdict |
|---|---|---|---|---|---|---|
| Diamond Naturals Large Breed Puppy | ★★★★☆ 4.3 | Large-breed growth | 1.5% max | $1.42 | $56.99 | Best Budget |
| Hill's Science Diet Large Breed Puppy | ★★★★★ 4.5 | Large-breed growth | 1.4% max | $2.81 | $78.99 | Top Pick |
| Purina Pro Plan Large Breed Puppy | ★★★★☆ 4.4 | Large-breed growth | 1.5% max | $2.33 | $69.99 | Recommended |
| Generic puppy kibble (no large-breed AAFCO) | ★★★☆☆ 2.6 | Growth only, not large-breed | Not specified | $1.10 | $36.99 | Skip |
Full specifications
| First ingredient | Pasture-raised lamb meal |
| Crude protein (min) | 27.0% |
| Crude fat (min) | 13.0% |
| Crude fiber (max) | 4.0% |
| Calcium (min/max) | 1.2% / 1.5% |
| Phosphorus (min) | 0.9% |
| DHA (min) | 0.05% |
| AAFCO statement | Growth, including growth of large-size dogs |
| Bag sizes | 6 lb, 20 lb, 40 lb |
| Country of manufacture | USA |
Should you buy the Diamond Naturals Large Breed Puppy Lamb Meal & Rice Formula?
Diamond Naturals Large Breed Puppy is the value pick we recommend for owners raising a future 50 to 100 lb adult dog. The first ingredient is pasture-raised lamb meal, the AAFCO statement covers growth of large-size dogs (which gives a calcium ceiling check), and the bag pricing is well below boutique large-breed puppy formulas. Tested at 27 percent minimum protein.
Frequently asked questions
Is Diamond Naturals Large Breed Puppy worth $57 for 40 lb in 2026?+
If you have a future large-breed adult and the budget matters, yes. The AAFCO statement explicitly covers growth of large-size dogs, which forces a calcium ceiling that matters for joint development.
Diamond Naturals vs Hill's Large Breed Puppy: which is better?+
Hill's edges out on first-ingredient quality (whole chicken vs lamb meal) and has a slightly tighter calcium ceiling. Diamond Naturals wins on price by roughly half. We recommend Hill's if budget allows, Diamond Naturals if not.
Why does the large-breed AAFCO statement matter?+
Large-breed puppy formulas have a calcium maximum (1.5 percent dry matter) on the AAFCO statement. Standard puppy kibbles do not, and excess calcium during growth has been associated with joint development problems in large breeds.
When should I switch from this to adult food?+
Most large breeds finish growth between 12 and 18 months. Transition over 7 to 10 days when your vet confirms the puppy has reached adult body condition.
Has Diamond Naturals had recalls?+
Diamond Pet Foods had a documented 2012 plant recall. There have been no recalls on the Large Breed Puppy line in the past 5 years per FDA records.
📅 Update log
- May 8, 2026Refreshed pricing on the 40 lb bag at Tractor Supply.
- Dec 12, 2025Initial review published after 6 months on a 14 kg labrador puppy.
Priya Sharma
Priya Sharma writes for The Tested Hub.
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