Hills Science Diet vs Purina Pro Plan Dog Food (2026)
Quick Verdict
| Category | Hill’s Science Diet | Purina Pro Plan |
|---|---|---|
| Overall Score | 8.6/10 | 8.8/10 |
| Ingredient Quality | High | High |
| Price (avg bag) | ~$65–$80/30 lb | ~$65–$75/30 lb |
| AAFCO Compliant | Yes | Yes |
| Best For | Balanced vet-recommended, weight management | Performance, probiotics, sensitive digestion |
Brand Overview
Hill’s Science Diet: Hill’s Science Diet has been a veterinarian staple since 1968, owned by Colgate-Palmolive. Known for its Optimal Care formulas, weight management (Healthy Weight), and prescription (Prescription Diet) line. Widely found in vet offices and pet stores.
Purina Pro Plan: Purina Pro Plan is Nestlé Purina’s research-backed premium line, widely vet-recommended. Features live probiotics, multiple life-stage formulas, and a Pro Plan Veterinary Diets line.
Ingredient Analysis
Hill’s Science Diet: Chicken as first ingredient, followed by chicken meal, cracked pearled barley, and brown rice. No artificial flavors, colors, or preservatives. Includes vitamin E and beta-carotene antioxidants. Chicken by-product meal in some formulas. Science Diet uses a balanced omega-6/3 ratio.
Purina Pro Plan: Real chicken or salmon first. Corn gluten meal as secondary protein. Live Lactobacillus acidophilus probiotic cultures. EPA from fish oil. No artificial flavors or colors in primary lines.
Nutritional Snapshot (Adult Maintenance)
| Nutrient | Hill’s Science Diet | Purina Pro Plan |
|---|---|---|
| Crude Protein (min) | 18% | 26% |
| Crude Fat (min) | 12% | 16% |
| Calories (kcal/cup) | ~363 | ~435 |
Pros and Cons
Hill’s Science Diet
Pros
- Vet-recommended and widely distributed in veterinary offices
- Excellent Healthy Weight formulas
- Prescription Diet line is comprehensive
- No artificial flavors, colors, or preservatives
Cons
- Lower protein than Pro Plan
- More expensive than comparable Pro Plan in some lines
- Contains chicken by-product meal
Purina Pro Plan
Pros
- Live probiotic cultures in most dry formulas
- Higher protein content
- Wide performance and specialty lines
- Strong research backing from Nestlé Purina
Cons
- Contains corn and corn derivatives
- Limited grain-free options
Best For
Choose Hill’s Science Diet if: Your dog needs weight management, your vet specifically recommends Science Diet, or you want access to Hill’s Prescription Diets.
Choose Purina Pro Plan if: Your dog has digestive sensitivities, high activity needs, or you want live probiotics and higher protein at a comparable price.
Alternatives
- [Royal Canin vs Purina Pro Plan](/compare/royal-canin-vs-purina-pro-plan)
- [Hills vs Blue Buffalo comparison](/compare/diamond-naturals-vs-blue-buffalo)
- [Full Science Diet Review](/reviews/hills-science-diet-dog-food)
FAQ
Is Hill’s Science Diet good?
Yes. Science Diet is one of the most extensively studied dog foods and is widely used in veterinary practices. Its Prescription Diet line is the gold standard for many medical conditions.
Which has higher protein, Science Diet or Pro Plan?
Pro Plan wins significantly—26% vs. 18% for Science Diet adult formulas. If protein content is a priority, Pro Plan is the better choice.
Do vets recommend Science Diet?
Yes, extensively. Hill’s has strong relationships with veterinary schools and clinics. Science Diet is among the top 3 vet-recommended brands.
Is Hill’s owned by Colgate?
Yes. Colgate-Palmolive acquired Hill’s Pet Nutrition in 1976. This gives Hill’s significant R&D resources.
Has Science Diet been recalled?
Yes. Hill’s had a significant 2019 voluntary recall for elevated vitamin D across multiple wet dog food products. This was resolved, and the brand has implemented additional quality controls since.
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