Which is better for a medium breed dog?

Royal Canin Medium Adult. It is the only one of the two formulated for dogs 23–55 lbs and ages 1–7. Blue Buffalo is a general adult formula with no breed-size target.

Is the Blue Buffalo worth it if my dog does fine on grains?

Only if you specifically want grain free or a named chicken main ingredient. Otherwise Royal Canin's breed-specific formula and slightly lower best price make it the stronger pick.

Which is cheaper right now?

Royal Canin, barely. Its best new price is $26.09 at eBay as of November 8, 2026, against $26.77 for Blue Buffalo. The gap is about 70 cents, so price should not decide this.

Which has a better ingredient list?

Blue Buffalo shows more: chicken as the named main ingredient and a grain-free recipe. Royal Canin does not state its flavor on the listing, so you cannot compare ingredients directly from what is shown.

Does either one last longer?

Neither is sold in a stated bag size here, so shelf life and cost per pound cannot be compared from the listings. Check the bag weight before buying either.

Can I switch a dog between them?

Yes, both are adult dry kibble. Transition over about a week, mixing increasing amounts of the new food, especially going to or from a grain-free formula.

Royal Canin Medium Adult Dry Dog Food vs Blue Buffalo Life Protection Grain Free Chicken

Buy Royal Canin Medium Adult if your dog is a medium breed (23–55 lbs, 1–7 years) and you want a diet built for that size and energy level. Buy Blue Buffalo Life Protection Grain Free if you want a chicken-first, grain-free kibble and the lower price matters. On price, Royal Canin's best new price is $26.09 at eBay as of November 8, 2026, with 4 stores selling it new; Blue Buffalo is $26.77, 42% off Chewy's $46.00 regular price. The two land within about 70 cents of each other at their best prices, so the choice comes down to formula fit, not cost.

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