Kirkland (Costco) vs Blue Buffalo Dog Food (2026)
Quick Verdict
| Category | Kirkland (Costco) | Blue Buffalo |
|---|---|---|
| Overall Score | 7.9/10 | 7.8/10 |
| Ingredient Quality | Good | Good |
| Price (avg bag) | ~$40–$50/40 lb (Costco) | ~$55–$65/30 lb |
| AAFCO Compliant | Yes | Yes |
| Best For | Costco members, outstanding value | Natural ingredients, LifeSource Bits, variety |
Overview
Kirkland Signature (made by Diamond Pet Foods for Costco) provides solid nutrition at bulk-bin pricing. Nature’s Domain grain-free uses salmon and sweet potato. Only available to Costco members.
Blue Buffalo (General Mills) is America’s best-selling natural pet food. LifeSource Bits, True Blue Promise (no by-products, corn, wheat, soy), and enormous product variety.
Ingredient Comparison
Kirkland Signature Adult uses chicken meal and whole grain corn as primary ingredients. Nature’s Domain uses salmon meal and sweet potato. No artificial preservatives, colors, or flavors. Decent nutrition for the price.
Blue Buffalo LPF uses deboned chicken first. LifeSource Bits throughout. Oatmeal, barley, sweet potato. No by-products, corn, wheat, soy.
Nutritional Snapshot
| Nutrient | Kirkland Signature | Blue Buffalo LPF |
|---|---|---|
| Crude Protein (min) | 27% | 24% |
| Crude Fat (min) | 16% | 14% |
| Calories (kcal/cup) | ~380 | ~368 |
Pros and Cons
Kirkland
Pros
- Exceptional value ($40–$50 per 40 lb bag)
- Higher protein than Blue Buffalo
- No artificial preservatives or colors
- Available in very large bags
Cons
- Made by Diamond Pet Foods (recall history)
- Costco membership required
- Limited variety and specialty options
Blue Buffalo
Pros
- LifeSource Bits antioxidant blend
- No by-products, corn, wheat, soy
- Wide variety across life stages
- Available everywhere
Cons
- Multiple recalls 2017–2019
- More expensive per pound
- General Mills ownership
Best For
Choose Kirkland if: You’re a Costco member and want excellent value for a healthy adult dog.
Choose Blue Buffalo if: You want LifeSource Bits, no by-products, and wider retail access.
Alternatives
- [Kirkland vs Purina Pro Plan](/compare/kirkland-vs-purina-pro-plan)
- [Diamond Naturals vs Blue Buffalo](/compare/diamond-naturals-vs-blue-buffalo)
FAQ
Is Kirkland as good as Blue Buffalo? By protein content, yes—Kirkland’s 27% beats Blue Buffalo’s 24%. Blue Buffalo wins on LifeSource Bits and by-product-free promise.
Who makes Kirkland dog food? Diamond Pet Foods under Costco contract.
Is Blue Buffalo worth more than Kirkland? For Costco members, Kirkland offers comparable nutrition at a far lower price. Blue Buffalo’s antioxidant blend and wider specialty options are the main value-adds.
Can I get Kirkland without a membership? A non-member can shop Costco.com (with a small surcharge), but in-store purchase requires membership.
Does Kirkland Nature’s Domain have a recall? No brand-specific recalls for Nature’s Domain.
*Disclosure: GetPetPros.com is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. We only recommend products we’ve independently evaluated.*