Raw Diets and Hidden Health Risks: What Every Pet Owner Should Know

Raw diets for dogs and cats are increasingly popular, touted for improved coat quality, palatability, and “natural” nutrition. While many pets do thrive on properly balanced raw diets, temporarily there are important considerations that pet owners and caregivers need to understand.

How Raw Diets Can Mask Underlying Health Issues

Raw diets can temporarily improve muscle tone, skin and coat appearance or digestion, making a pet look "healthier" than they are internally. This masking effect can make it harder to detect:

Dental disease: raw diets don’t prevent plaque or gingivitis, and soft tissues may still be inflamed or infected.
Systemic illness: chronic infections, kidney disease, or early organ dysfunction may go unnoticed because outward appearance seems “good.”
Nutritional imbalances: not all raw diets are properly formulated, which can contribute to subtle deficiencies that take months to manifest.

Because raw diets can improve superficial signs like shiny fur or stool quality, owners may assume the pet is completely healthy, delaying veterinary diagnostics that would reveal underlying disease.

Skin and Coat Issues

Raw diets may improve coat shine or reduce shedding temporarily.
Bacterial or nutrient imbalances from poorly formulated raw diets can cause:
- Scabs, rashes, or sores
- Dry or brittle fur
- Recurrent infections
The visual improvement in coat or skin can make these issues less obvious, allowing chronic problems to persist unnoticed.

Chronic problems may still exist

Even with cosmetic improvements, some pets may still develop or continue to have issues such as:

Ear infections

Yeast overgrowth

Bacterial skin infections

Allergies or underlying inflammatory conditions

If the coat looks great, these problems might be downplayed or attributed to other causes (environment, grooming, seasonal allergies, etc.).

Reputation bias in diet communities

In some raw-feeding communities or brands, there can be confirmation bias:

Positive visual changes are highlighted as proof the diet works.

Ongoing health problems may be explained away to avoid questioning the diet itself.

This doesn’t mean raw diets always cause those problems—just that cosmetic improvements alone aren’t a reliable indicator of overall health.

4. What actually matters for evaluating a diet

Ethical Veterinarians usually recommend looking at broader indicators:

Body condition score

Stable weight

Normal stool quality

Healthy ears and skin

Bloodwork results

Long-term health outcomes

Not just coat and muscle appearance.

Balanced perspective

Some pets genuinely do well on carefully formulated raw diets, until dental disease takes it's toll, and keep in mind that often raised concerns include:

Nutritional imbalances

Bacterial contamination (e.g., Salmonella or E. coli)

Lack of controlled long-term studies compared to commercial diets

The Role of Holistic Approaches

Certain holistic or “wellness-focused” ideologies emphasize diet and gut health as a cure-all, sometimes overvaluing fecal tests or raw diet benefits. This can:

Encourage overreliance on diet alone to maintain health
Allow underlying disease to go undetected because outward signs are improved
Avoid critical diagnostics like bloodwork, urinalysis, or oral exams
Give owners a false sense of security that their pet is healthy

While holistic care can complement veterinary medicine, when it prioritizes appearance or gut-focused results over proper diagnostics, it can unintentionally prolong suffering or delay treatment.

Protecting Your Pet’s Health

Don’t rely on diet alone: Raw diets can support health but cannot replace proper veterinary assessment.
Regular examinations from ethical and with proper readings: Oral exams, bloodwork, urinalysis, and physical checks are critical for early detection of disease.
Monitor subtle signs: , changes in appetite, stool, urine, or skin lethargy should not be dismissed just because the coat looks shiny or stool appears normal.
Seek second opinions: If you suspect hidden issues, consulting another veterinarian can help ensure nothing is missed.

Raw diets can improve visible signs like coat quality and stool consistency temporarily, but these improvements do not guarantee systemic health. Without proper diagnostics, diseases especially dental, urinary, and organ-based conditions can remain hidden. Holistic trends may unintentionally allow this masking effect to persist, emphasizing the importance of balanced nutrition combined with evidence-based veterinary care

Why Raw Diets Can Improve Coat Appearance

Several biological factors in raw diets can temporarily or visibly improve a pet’s coat and skin.

1. Higher Fat Content

Raw diets are often higher in animal fat than many commercial foods. Dietary fats improve:

Skin barrier function
Hair follicle health
Coat shine and softness

Fatty acids—especially omega-3 and omega-6—help reduce inflammation in the skin and increase sebum production, which gives the coat a glossy appearance.

Relevant biological concept: Essential Fatty Acids

However, improved skin oil production does not necessarily resolve infections or allergies.

2. Increased Moisture Intake

Raw foods typically contain 60–75% water, compared with about 10% in dry kibble.

Higher hydration can lead to:

Better skin elasticity
Reduced visible dryness or flaking

But hydration alone does not prevent yeast or bacterial colonization.

3. Protein Quality and Amino Acids

Raw diets often contain large amounts of fresh animal protein, which supplies amino acids needed for hair growth, such as:

Methionine
Cysteine

Hair shafts are primarily made of keratin, a structural protein.

Relevant biological concept: Keratin

This can improve coat density and texture even if other dermatological issues persist.

4. Reduced Processing

Some proponents argue that raw diets retain more natural nutrients because they are not heat-processed.

Processing (used in most kibble) can degrade certain nutrients, though commercial foods compensate through fortification and formulation standards set by organizations like Association of American Feed Control Officials.

5. Why Infections Can Still Occur

Despite cosmetic improvements, pets may still develop:

Ear infections
Yeast overgrowth
Bacterial dermatitis

Common organisms involved include:

Staphylococcus pseudintermedius (common canine skin bacteria)
Malassezia pachydermatis (yeast linked to ear/skin infections)

These problems are often related to allergies, immune responses, or microbiome imbalance, not simply diet quality and yet these are the problems which led to the use/ switch to raw diet in the first place.

The Contradiction: Visible Improvement vs. Ongoing Medication

1. If the diet solved the root problem, medication wouldn’t still be necessary

If a diet truly resolved the underlying cause of a pet’s dermatological disease, the need for medications such as Apoquel (oclacitinib) or anxiety itch medication such as Fluoxetine, Clomipramine, Cytopoint would typically decrease or stop.

Apoquel works by blocking cytokine signals involved in itching and inflammation, commonly used to treat Atopic Dermatitis in dogs.

Cytopoint Injectable monoclonal antibody. Neutralizes interleukin-31, a key itch signal. Relevant concept: Interleukin‑31. This medication targets itch pathways specifically, not behavioral causes.

Fluoxetine (behavioral med- Anxiety, compulsive licking, obsessive grooming )A selective serotonin reuptake inhibitor (SSRI).

Clomipramine (Tricyclic antidepressant used for anxiety-driven behaviors) prescribed when licking or chewing is stress-related- note the pain from licking or chewing is a cause of stress not a random factor.

Trazodone (anxiety medication) Often used for stressful events (vet visits, grooming, travel).

So when:

A dog’s coat looks significantly better after a diet change
But the dog still requires ongoing medicines for itching, or stress caused by the itching

…it suggests that the underlying immune-driven allergic disease is still present.

The diet may be improving cosmetic indicators, but not eliminating the pathological mechanism.

2. Cosmetic improvements can distract from clinical signs

Coat gloss, reduced shedding, and thicker hair are surface-level markers. Meanwhile, underlying conditions may continue:

Chronic ear inflammation
Yeast infections
Bacterial skin infections

Common organisms associated with these issues include:

Malassezia pachydermatis
Staphylococcus pseudintermedius

If the coat looks healthier, owners may assume the diet fixed the problem and attribute infections to other causes like weather, grooming, or environment.

3. Symptom suppression vs. disease resolution

Symptom control medications are temporary fixes rather than cures.

They reduce:

itching
inflammatory signaling
scratching behavior

But they do not remove the allergic trigger.

So if a dog:

appears improved due to diet
yet still requires symptom suppression

this indicates the root disease process remains active.

4. Confirmation bias in diet discussions

Another reason this contradiction persists is confirmation bias.

Owners may focus on improvements that support the belief that the diet works:

shinier coat
less shedding
more energy

While dismissing persistent issues such as:

ear infections
skin flare-ups
medication dependence

This creates a narrative that the diet cured the condition, even when medical treatment is still doing most of the disease control.

5. What Dermatology typically evaluates

Dermatology generally assess improvement using broader criteria, including:

reduction in itching score
absence of recurrent infections
decreased reliance on medications
stable skin barrier function

Not just coat appearance.

Hair length vs. coat density are different biological traits

"Coat and skin improvement" honeymoon phase if you don't know what to actually look for.

Hair growth depends largely on protein intake and hair-cycle signaling, while coat density depends on:

follicle health
genetics
hormonal regulation
skin barrier function

Relevant concept: Hair Growth Cycle

A diet high in protein can stimulate hair shaft growth, causing hair to grow longer, but that does not necessarily increase follicle density or undercoat thickness.

So you may see:

longer hair
softer hair shafts

but sparser or less dense undercoat which leads to also "less shedding" concept.

Long coats can trap moisture and oils

When coats become longer without proper density balance, they can:

trap skin oils
retain moisture near the skin
reduce air circulation

This environment can encourage yeast proliferation, especially from organisms like Malassezia pachydermatis.

Yeast thrives in:

warm
oily
humid microenvironments on skin.

Yeast overgrowth may be more obvious in long-haired breeds

In long-haired dogs, yeast infections may lead to:

greasy coat texture
musty odor
darkened skin
buildup near ears, paws, and skin folds

However, the longer hair can hide redness, scabs, Ingrown hair shafts, small bumps or pustules, circular hair loss (“epidermal collarettes”), ingrown or twisted hairs under the skin or irritation, so the infection may persist before it’s noticed.

Short-haired dogs often show:

redness
scaling
inflammation
Ingrown hair shafts
small bumps or pustules
circular hair loss (“epidermal collarettes”)

ingrown or twisted hairs under the skin

more clearly on the skin surface.

4. Coat appearance vs. skin health

A coat can appear visually longer or shinier while the skin underneath is experiencing:

yeast overgrowth
bacterial colonization
chronic inflammation

These are often linked to underlying diseases such as Canine Atopic Dermatitis.

That’s why dermatology evaluations focus on:

skin condition
microbial balance
itch levels
infection recurrence

not simply coat appearance.

5. Why some people perceive improvement anyway

Several factors can create the impression of improvement:

Higher fat content increasing shine
Longer hair giving a fuller look
Owner expectation bias
Veterinarians often classify a dog as generally healthy if there is no systemic disease or serious infection, even when mild dermatological findings are present. For example, findings such as: scaling, scabs, follicular bumps may be considered minor dermatologic changes rather than indicators of a serious disease process. Communication gaps another common source of frustration is differences in what “healthy” means.
For some owners, healthy often means: clear skin, no scabs, no itching, dense, normal coat
For some clinicians, “healthy” may mean: no systemic illness, no severe infection, manageable dermatologic signs. Veterinarian simply uses a different clinical threshold.

Hair can grow longer without becoming healthier or denser. If the skin barrier and immune balance are not improved, longer coats may actually create conditions that allow yeast such as Malassezia pachydermatis to accumulate, especially in long-haired dogs.

Resources

Freeman, L. M., Chandler, M. L., Hamper, B. A., & Weeth, L. P. (2013). Current knowledge about the risks and benefits of raw meat–based diets for dogs and cats. Journal of the American Veterinary Medical Association, 243(11), 1549–1558. https://doi.org/10.2460/javma.243.11.1549

Schlesinger, D. P., & Joffe, D. J. (2011). Raw food diets in companion animals: A critical review. Canadian Veterinary Journal, 52(1), 50–54.

Weese, J. S., Rousseau, J., & Arroyo, L. (2005). Bacteriological evaluation of commercial canine and feline raw diets. Canadian Veterinary Journal, 46(6), 513–516.

Hand, M. S., Thatcher, C. D., Remillard, R. L., Roudebush, P., & Novotny, B. J. (2010). Small animal clinical nutrition (5th ed.). Mark Morris Institute.

Case, L. P., Daristotle, L., Hayek, M. G., & Raasch, M. F. (2011). Canine and feline nutrition (3rd ed.). Mosby Elsevier.

American Veterinary Medical Association. (2022). Raw or undercooked animal-source protein in cat and dog diets. Retrieved from https://www.avma.org

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