If your dog is 7 or older, their nutritional needs have genuinely changed — and cheap kibble usually isn't cutting it anymore. After looking hard at what's actually in these formulas, Hill's Science Diet Adult 7+ is our top pick for most senior dogs, but Purina Pro Plan is a legitimate alternative worth knowing about.
Hill's has been feeding aging dogs for decades, and the Adult 7+ formula shows why. It's built around easy digestibility, controlled sodium levels, and clinically tested nutrition — that last part matters more than it sounds, because Hill's actually funds feeding trials rather than just working from nutrient profiles on paper.
The texture is soft and moist, which is a real bonus for older dogs dealing with dental issues or reduced appetite. It's not glamorous, but it works — and vets consistently recommend it, which tells you something.
The 12-pack makes rotating meals easy, and the price-per-can is reasonable for a vet-grade formula. It won't thrill you with exotic ingredients, but your senior dog doesn't need exotic — they need consistent, well-calibrated nutrition.
Purina Pro Plan has earned serious credibility in the pet nutrition world — it's one of the few brands that invests heavily in research, and their Senior 7+ formula reflects that. High protein content (real chicken leads the ingredient list) helps maintain muscle mass in older dogs who tend to lose lean tissue faster than younger ones.
Where it stands out over Hill's is protein percentage and flavor variety — dogs who turn their nose up at Hill's often dig into Pro Plan enthusiastically. It also includes prebiotic fiber for digestive health, which matters a lot in senior dogs whose gut microbiomes can get finicky.
The trade-off is that it contains more sodium than Hill's, which makes it a less ideal choice if your dog has diagnosed heart or kidney issues. For a healthy senior dog without specific medical concerns, though, it's a strong contender.
For most senior dogs, Hill's Science Diet Adult 7+ is the one we'd buy first. The clinical nutrition backing and kidney-conscious formula make it the safer, smarter default — especially if your dog is getting older and you haven't had a recent vet checkup to assess organ health.
That said, if your senior dog is otherwise healthy and you've been fighting a losing battle with a picky eater, Purina Pro Plan is worth the try. Higher protein and better palatability make it a real competitor for dogs without specific medical needs.
Either way, both options beat the generic stuff at the grocery store by a significant margin. Your dog's liver and kidneys will thank you for it down the road.
Get Hill's Science Diet on Amazon →Most dogs are considered senior around age 7, though large breeds can start showing age-related changes earlier — closer to 5 or 6. The real trigger isn't a number on a calendar, it's physical changes: slower metabolism, reduced activity, dental wear, or the beginning of kidney/joint issues. If you're seeing any of those, it's worth making the switch and scheduling a vet checkup. A blood panel at this stage can tell you a lot about what your dog actually needs from their diet.
For many senior dogs, yes — wet food has genuine advantages. It's higher in moisture, which supports kidney function and helps dogs who don't drink enough water. The softer texture is easier on worn or sensitive teeth. And older dogs with reduced appetite are often more willing to eat wet food because the smell and taste are more pronounced. That said, some dogs do fine on high-quality dry kibble, and some owners add a spoonful of wet food as a topper. It doesn't have to be all-or-nothing.
High sodium is the big one — it puts unnecessary strain on aging kidneys and hearts. Excess phosphorus is also worth watching for dogs with any early kidney disease, since the kidneys struggle to process it. Artificial preservatives, colors, and fillers like corn syrup don't add nutritional value and some dogs react poorly to them. You also want to avoid low-quality protein sources (vague "meat by-products" at the top of the list) — older dogs need good protein to hold onto muscle mass, not just protein quantity. Both picks on this page handle these concerns reasonably well.