At Foodynamics, we freeze-dry only biologically appropriate, whole foods—crafted for the nutritional needs of cats, dogs, and humans. Our commitment to species-appropriate nutrition means we never compromise with processed additives or artificial enhancements. Yet, even the healthiest food is only beneficial if it is consumed.
Many pet parents express concern when transitioning their dog from ultra-processed foods or treats to a more natural diet. Common worries include digestive upset or outright food refusal. It is understandable to be concerned about diarrhea or a dog skipping meals—but in most cases, patience is more powerful than panic.
Canine Biology: Why Some Dogs Refuse New Foods
Have you ever offered your dog a healthier food option only to be met with disinterest or refusal? This is not uncommon, especially when transitioning from highly palatable, additive-laden commercial foods to nutrient-dense whole foods. However, healthy dogs do not typically starve themselves. In fact, short-term food refusal may reflect a natural biological response rooted in the dog’s evolutionary design.
Most healthy dogs will begin eating when they become hungry enough. From an evolutionary standpoint, fasting was part of survival. Unlike modern feeding schedules, wild dogs and wolves often experienced long periods without food. Their bodies metabolism allows this without physical harm (Scanlan, 2011; Brady et al., 1977).
Do Not Apply These Principles to Cats
Fasting can be dangerous—even fatal—for felines. Cats can develop hepatic lipidosis after even short periods without food. These fasting recommendations are specific to dogs only. Always feed cats regularly with high-quality, species-appropriate meals. We have an article coming out soon on strategies on how to transition cats to healthier diets!
Why Dogs Tolerate Fasting Better Than Humans
Dogs are metabolically unique. Compared to humans, they exhibit remarkable resilience during fasting periods. While a human may feel fatigued or ill after skipping meals, a dog can function normally, thanks to their evolutionary lineage. Unlike obligate carnivores like cats, dogs are facultative carnivores, and their metabolic systems are designed to manage short-term caloric deficits efficiently (Godfrey, n.d.). A healthy dog, as long as they stay hydrated, can go a very, very long time without eating. We have an article coming out soon on strategies on how to keep felines hydrated!
Health Benefits of Intermittent Fasting in Dogs
Veterinary science has begun to affirm what nature has long demonstrated: periodic fasting offers measurable health benefits for many dogs.
1. Longevity: A longitudinal study of Labrador Retrievers found that those fed 25% fewer calories lived nearly two years longer than their free-fed counterparts (Bray et al., 2022).
2. Disease Reduction: Dogs fed once daily exhibited fewer gastrointestinal issues, reduced incidence of orthopedic and kidney disease, better oral health, and enhanced cognitive function (Bray et al., 2022).
These benefits may stem from improved insulin sensitivity, reduced chronic inflammation, and enhanced autophagy (the body’s cellular recycling process).
Transitioning Dogs to Whole Foods: Practical Tips
While many dogs take to real food quickly, others may resist—particularly if they are accustomed to synthetic flavors and fillers. Here is how to help:
- #1 Method! Skip a Meal: For healthy adult dogs, skipping one or two meals can naturally increase hunger and motivation to eat. You can wait a dog out for days as long as they stay hydrated.
- Stay Consistent: Avoid giving in to picky behavior by offering high-value “junk” foods. This undermines the transition.
- Gradual Introduction: Start by mixing a small amount of the new food with the old. Gradually increase the new food over 5–10 days.
Not Ready To Make The Full Transition?
Add Whole Food Toppers: Bone broth, fermented goat milk, or raw eggs can make whole foods more enticing.
Hydration Is Non-Negotiable
While dogs can go without food for several days without harm, they must have continuous access to fresh water. Dehydration can occur within 24 hours and may lead to serious complications. Bone broth, goat milk, or even cucumber-infused water can increase hydration in reluctant drinkers. Always monitor for signs of dehydration such as dry gums, lethargy, or sunken eyes.
Digestive Upset During Transition: What to Do
If your dog experiences diarrhea, constipation, or inconsistent stools during the switch, consider these steps:
- #1 Method: Add a dietary fiber to their diet first! Fermentable fibers that nourish gut bacteria. Support Gut Repair: Okra, slippery elm, psyllium husk, chicory root (inulin), organic steel-cut, sprouted oats supply, Jerusalem artichokes, asparagus, Brussels sprouts, broccoli sprouts, dark leafy greens (arugula, endive), green beans ,beta glucans, and marshmallow root can support intestinal mucosa.
- Add Prebiotics and Probiotics: Use supplements or whole foods like dandelion greens, cow kefir, fermented goat milk, or soil-based supplements.
- Test if Symptoms Persist: Use tools like the NutriScan food sensitivity test, or screen for parasites like Giardia. In rare cases, undigested food in the stool may indicate pancreatic insufficiency—consult your veterinarian if symptoms persist.
Conclusion: Feed with Wisdom, Wait with Patience
God designed dogs with incredible adaptability. Intermittent fasting—when managed responsibly—can align with their God-given physiology and restore health, clarity, and vitality. Veterinary insights confirm dogs’ unique fasting resilience, emphasizing patience when introducing new diets or feeding routines.
“A righteous man has kind regard for the life of his animal…” – Proverbs 12:10, AMP
References
Brady, L. J., Armstrong, M. K., Muiruri, K. L., Romsos, D. R., Bergen, W. G., & Leveille, G. A. (1977). Influence of prolonged fasting in the dog on glucose turnover and blood metabolites. Journal of Nutrition, 107(6), 1053–1060. https://doi.org/10.1093/jn/107.6.1053
Bray, E. E., et al. (Dog Aging Project Consortium) (2022). Once-daily feeding is associated with better health in companion dogs: results from the Dog Aging Project. Geroscience, 44(3), 1779–1790. https://doi.org/10.1007/s11357-022-00575-7
Godfrey, H. (n.d.). How long can a dog go without eating? A vet answers. Raised Right Pets Blog. Retrieved from https://www.raisedrightpets.com/blog/how-long-can-a-dog-go-without-eating/
Scanlan, N. (2011, July 11). The health benefits of therapeutic fasting. Veterinary Practice News. Retrieved from https://www.veterinarypracticenews.com/the-health-benefits-of-therapeutic-fasting/
The Kennel Club (2021). Feeding a fussy eater. The Kennel Club UK. https://www.thekennelclub.org.uk/health-and-dog-care/health/health-and-care/a-z-of-health-and-care-issues/feeding-a-fussy-
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