What This Means for Your Dog’s Bowl
Alternative grains in dog food can hold their own against wheat—at least when it comes to how well dogs digest them and how healthy they look afterward. A new nutritional study tested rye and triticale (a grain that is a hybrid of wheat and rye) alongside wheat in dog diets. The results were reassuring: dogs digested all three grains similarly, produced comparable stool, and showed similar blood marker results across the board.
If you have ever stood in a pet store wondering whether a dog food made with less common grains is actually good for your dog, this study offers some evidence-based perspective.
The Grain Debate in Dog Food
Walk down any pet food aisle and you will see a confusing mix of claims: grain-free, ancient grains, whole grains, single-grain formulas. The noise can make it hard to know what really matters for your dog’s health.
Wheat has long been a common ingredient in dog food because it is widely available and well understood. But as pet food makers look for more variety—and as supply chains shift—there is growing interest in using other grains like rye and triticale. The problem is that the science has not always kept pace with the marketing. Relatively little research has directly compared these alternative grains to wheat in dogs, so this study set out to fill that gap.
How the Study Worked
Researchers put together dog foods containing one of three grains: wheat, rye, or triticale. They then ran two separate tests.
Digestibility trial (18 dogs):
- Dogs were fed diets containing each grain.
- Researchers measured how much of the food the dogs actually absorbed—essentially, what went in versus what came out.
- Stool quality (firmness, consistency, appearance) was also scored.
- Blood samples were taken to check key health markers.
Preference test (21 dogs):
- Dogs were offered foods with different grains to see if they showed a clear preference for one over another.
- Behavior during feeding was used as a stand-in for palatability (how appealing the food was to eat).
All foods were made using standard extrusion—the same process used to make most dry kibble—so the comparison reflected real-world commercial production conditions.
Key Findings
Digestion and Stool Quality Were Similar
The headline result: rye and triticale were not meaningfully worse than wheat in terms of how well dogs digested them. Digestibility scores were comparable across all three diets. This matters because if a dog cannot break down and absorb the nutrients in their food, those nutrients are wasted—and the dog can end up with poor stools, low energy, or nutritional gaps.
Stool quality also came out similar across the groups. Good stool consistency is one of the most practical day-to-day indicators that a dog’s digestive system is handling their food well. Pet owners who have switched to a new food and dealt with the aftermath of loose stools will appreciate that rye and triticale did not appear to cause extra digestive upset.
Blood Markers and Palatability Held Up Too
Blood chemistry results—the kind of values a vet checks to get a snapshot of overall health—were also comparable between the grain groups. No grain diet triggered red-flag results. Dogs did not show marked differences in feeding behavior between the diets either, suggesting that palatability (taste appeal) was roughly equivalent.
What This Means for Pet Owners
You Don’t Need to Fear Rye or Triticale on a Label
If your dog’s food lists rye or triticale as an ingredient, this study suggests there is no reason to worry that your dog is missing out compared to a wheat-based diet. Based on these findings, your dog is likely digesting those grains just as efficiently as wheat.
This is also good news for variety. Rotating between dog foods that use different grains may be easier to do with confidence, knowing that these alternatives appear to be genuinely comparable—not just marketing substitutes.
Grain-Free Is Not Automatically Better
One broader takeaway from this research is that the conversation around dog food grains is often louder than the science behind it. Well-formulated grain-inclusive foods—whether they use wheat, rye, triticale, or other grains—can be entirely appropriate for most dogs. Grain-free is not inherently superior, and grain-inclusive is not inherently inferior.
When to Consult Your Veterinarian
Most healthy dogs do not need special grain considerations. However, if your dog has a confirmed grain allergy or sensitivity, these findings do not override that individual medical history. Dogs with inflammatory bowel disease, chronic loose stools, or other digestive conditions should have their diet guided by a veterinarian. If you want to switch your dog’s food—whether grain type or brand—your vet can advise on how to transition safely.
Study Limitations
The study used a relatively small number of dogs (18 in the digestibility trial, 21 in the preference test), which limits how widely we can apply the findings. Results may not hold for every dog breed, age group, or health status. The dogs in the study were healthy adults, so we cannot assume the same outcomes for puppies, seniors, or dogs with health conditions. The study also focused on extruded (kibble) diets, so the findings may not extend to raw, wet, or freeze-dried formats. Longer-term effects of feeding rye or triticale across a dog’s lifetime were not studied here.
Bottom Line
This nutritional study found that rye and triticale performed just as well as wheat when tested in dog diets. Digestibility, stool quality, blood health markers, and palatability were all comparable across the three grains. For most healthy dogs, a well-formulated food using rye or triticale appears to be a perfectly viable alternative to wheat-based formulas. When in doubt about any diet change, your veterinarian is always the best source of guidance for your specific dog.
Disclaimer
This article summarizes peer-reviewed research for educational purposes. Always consult with your veterinarian for personalized advice about your pet’s health and behavior.