If you’ve ever brought a beloved pet into our clinic for a routine checkup, only to learn they’re suffering from a hidden nutritional deficiency, you know how disheartening that can feel. I’ve been in veterinary medicine for 12 years now, and I’ve seen firsthand how easily these deficiencies slip under the radar—sometimes because pet parents don’t realize their furry friend’s diet is falling short, and sometimes because the standard commercial foods they rely on aren’t providing the balanced nutrition they claim to. As a veterinary supply partner for over 8 of those years, I’ve worked closely with veterinarians to refine how we spot, diagnose, and treat these gaps, and today I want to pull back the curtain on that process. Veterinary
Let’s start with the basics: what even causes a nutritional deficiency in pets? For dogs and cats (our most common patients), deficiencies usually fall into two categories—primary and secondary. Primary deficiencies stem from a diet that’s incomplete or unbalanced on its own. Think about a dog owner who feeds their pet nothing but plain chicken and rice because they think it’s “healthy,” not realizing it lacks essential amino acids like taurine for cats, or sufficient calcium for growing puppies. For cats, taurine is a non-negotiable; without it, they can develop dilated cardiomyopathy, a condition that weakens the heart muscle and can be fatal if not caught early. Secondary deficiencies, on the other hand, are trickier: they happen when a pet’s body can’t absorb, process, or use nutrients properly. A dog with chronic diarrhea, for example, might not absorb vitamin B12 from their food, even if their diet is balanced. Or an older cat with kidney disease might struggle to metabolize certain minerals, leading to imbalances that show up as something as subtle as dull fur or low energy.
Spotting these deficiencies is the first and most critical step, and it’s rarely as simple as a visual check. Early on, the signs can be easy to miss—pet owners might chalk up their dog’s brittle nails to age, or their cat’s weight loss to a “busy lifestyle” instead of a nutrient gap. That’s why we, as veterinarians, always start with a detailed history, not just a physical exam. I spend 10 to 15 minutes every appointment talking through what a pet eats: do they get table scraps? Are they on a budget brand that only meets minimum AAFCO (Association of American Feed Control Officials) standards? Do they have any health conditions that might affect digestion? Once we have that background, we pair it with lab work to confirm a deficiency—blood tests for things like vitamin D, zinc, or taurine, and sometimes even urine tests to check for mineral imbalances.
Last year, we had a 3-year-old golden retriever named Max come in with recurring skin infections and slow wound healing. His owner, Lisa, had been feeding him a popular grain-free kibble that she’d researched online, so she didn’t think diet was the issue. But when we ran his labs, his zinc levels were 30% lower than the normal range. Zinc is key for skin health and immune function, and even small deficits can show up as persistent rashes or slow healing. The kibble he was on had enough zinc on paper, but it was bound by phytates from the grains, which the dog’s body couldn’t break down properly—so he wasn’t absorbing it. That’s a secondary deficiency, and it’s a perfect example of why diet alone isn’t always enough to diagnose the problem.
Once we’ve confirmed a deficiency, the next step is treatment, and this is where having the right veterinary supplies makes all the difference. We don’t just send a pet home with a bag of generic supplements, though. We tailor the plan to the individual and their needs. For primary deficiencies, like a kitten missing taurine, we’ll first adjust their diet to a high-quality, species-appropriate food that’s formulated to meet their life stage (kittens need more protein and calories than adult cats, for example). But for severe cases, we’ll add targeted supplements—like taurine chews or liquid vitamins—that are made specifically for veterinary patients, not just over-the-counter products from a big box store.
As a veterinary supply partner, I’ve seen how many pet owners reach for cheap, unregulated supplements online, and that’s a risk I can’t stress enough. A study we worked on a couple years back found that 60% of over-the-counter multivitamins for dogs didn’t have the labeled amount of vitamin D—some had 200% more, which can be toxic, and some had 50% less, which does nothing. Our team works closely with veterinarians to source supplements that are third-party tested, so we know exactly what’s in them, and we provide clear dosing guidelines that take into account a pet’s weight, age, and health conditions. For Max, the golden retriever, we didn’t just put him on a zinc supplement—we switched him to a grain-inclusive kibble that had phytate inhibitors, so his body could absorb the zinc naturally, and within 8 weeks, his skin infections were gone and his lab levels were back to normal.
Another thing we focus on is long-term management, not just fixing the immediate deficiency. A few months ago, we had an older cat named Mittens who had kidney disease, and her blood work showed low potassium. Potassium is vital for heart and muscle function, and for cats with kidney issues, imbalances are common. Instead of just giving her a potassium pill, we worked with the veterinary nutritionists on our supply team to find a kidney-friendly food that had the right amount of bioavailable potassium, and we adjusted her supplement dose as her kidney function changed. This isn’t a one-and-done fix—pet nutritional deficiencies are often chronic, especially in older animals or those with underlying health conditions, so we need to stay on top of their diet for years.
I also want to talk about a common misconception: that “homemade” diets are always healthier. Many pet parents swear by making their dog or cat’s food at home, and while that can be great if it’s done correctly, it’s extremely easy to create a deficiency. A friend of mine in another clinic had a pit bull who was on a homemade diet of only ground beef, rice, and carrots—no calcium, no phosphorus, and no taurine. He ended up with brittle bones and a heart murmur by the time he was 2 years old, all from gaps in his homemade meal plan. That’s why we recommend that any homemade diet be formulated by a veterinary nutritionist, and that we provide regular blood work to check for deficiencies. Our supply team works with these nutritionists to create balanced homemade diet recipes that include all the necessary nutrients, so pet parents don’t have to guess.
As a veterinary supply partner, we’re not just selling products—we’re part of the care team that helps veterinarians keep pets healthy. We regularly host workshops for local clinics on recognizing nutritional deficiencies, and we provide free nutritional testing kits so vets can catch gaps early. We also work with pet food manufacturers to ensure that their products meet not just minimum AAFCO standards, but the higher levels that veterinary nutritionists recommend for pets with special needs. For example, we recently collaborated on a line of senior pet foods that have added omega-3 fatty acids to support joint health and cognitive function, which are common areas of deficiency in older dogs and cats.
If you’re a veterinarian reading this (or a pet owner who wants to understand what goes into your pet’s care), the key takeaway is that handling pet nutritional deficiencies is a team effort. It starts with a thorough look at diet and health history, uses lab work to confirm the problem, and relies on targeted, third-party tested supplements and diets to fix it. The right supplies make that process smoother for both vets and pet parents, ensuring that even hidden deficiencies don’t turn into serious health issues.
If you’re looking to refine your clinic’s nutritional support offerings, or if you want to source high-quality, veterinary-exclusive supplements and foods, we’d be happy to discuss how we can partner with you. Our team has over a decade of experience working alongside veterinarians to address nutritional gaps, and we can help you create customized plans for every patient. Reach out to start a conversation about how we can support your clinic’s care goals for pets.
Accessories References
- Association of American Feed Control Officials. 2023. Official Publication.
- Fascetti, A.J., and S.A. Delaney. 2019. Veterinary Nutrition and Applied Pet Food Technology.
- Guerin, E.H., et al. 2021. “Label Accuracy of Over-the-Counter Multivitamin Supplements for Dogs.” Journal of Veterinary Medical Science.
- National Research Council. 2020. Nutrient Requirements of Dogs and Cats.
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