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Apr 17 • WEEKLY CLASS
Friday Insight: Why Your Pets Act the Way They Do
I’m switching it up today. The last time I taught a class on pets, something unexpected happened, the room lit up. People realized their animals were broadcasting physiological clues they’d never been taught to read. And honestly? It’s time to go back there. It’s Friday, the perfect day to drop another class that flips the way you think about your pet’s behavior on its head. So today, we’re diving in again, deeper, clearer, and with a whole new layer of physiology you didn’t know you needed.
Your Pet’s “Behavior Problem” Might Not Be a Behavior Problem at All
I’m going to say something that might sound strange at first:
Your pet’s behavior is not the problem. It’s the signal.
Most people think their dog is “reactive,” their cat is “anxious,” or their pet is “just sensitive.”
But here’s the part no one tells you:
Animals don’t act out, they broadcast. And what they’re broadcasting is physiology.
The gut. The immune system.
The nervous system. The stress load.
The metabolic swings. The inflammation you can’t see yet.
Behavior is just the language.
Once you learn to read it, everything changes.
THE PET GUT: THE HIDDEN ORGAN RUNNING THEIR BEHAVIOR
Your pet isn’t misbehaving. Their gut is talking.
Most people think their pet’s behavior is a training issue. Or a personality issue. Or a “my dog is just anxious” issue.
But here’s the truth no one tells you:
Your pet’s gut is the loudest organ in their entire body, and it speaks through behavior long before it speaks through diarrhea.
If you want to understand your pet’s behavior, you have to understand their gut.
Most pet parents think behavior starts in the brain. Functional medicine knows it starts much lower.
The gut is the largest immune organ, the biggest endocrine organ, the most metabolically active tissue, and the primary producer of neurotransmitters in your pet’s body.
And when it’s inflamed, stressed, underfed, overburdened, or dysbiotic?
Your pet’s behavior becomes the symptom.
Let’s go deeper, clinically, physiologically, behaviorally
1. The Microbiome Is the Real Trainer in Your House
Dogs and cats evolved to eat fresh prey. Not cereal.
Not pellets. Not “chicken flavor” dust glued to starch.
When the microbiome becomes a monoculture (thanks, kibble), you get:
  • More inflammation
  • More LPS
  • More cortisol
  • Less serotonin
  • Less impulse control
  • Less emotional resilience
And suddenly your pet is:
  • Barking at leaves
  • Hiding from the vacuum
  • Chewing your couch
  • Acting like a tiny furry doomsday prepper
This isn’t “bad behavior.” It’s gut-driven neurobiology.
Your pet’s microbiome isn’t just “gut bacteria.” It’s a neurochemical factory that:
  • Produces serotonin, dopamine precursors, and GABA
  • Regulates cortisol
  • Shapes immune tolerance
  • Controls inflammation
  • Influences learning, memory, and emotional resilience
When the microbiome is diverse and stable, your pet is:
  • Calm
  • Adaptable
  • Curious
  • Trainable
  • Emotionally regulated
When the microbiome is damaged (kibble, antibiotics, stress, toxins), you get:
  • Hypervigilance
  • Reactivity
  • Separation anxiety
  • Compulsive licking
  • “Random” aggression
  • Fearfulness
  • Difficulty learning
This isn’t personality. It’s microbial neurochemistry.
2. Blood Sugar Swings = Behavior Swings
If you’ve ever seen a toddler after a cupcake, you already understand this section.
High-carb kibble = glucose spikes = cortisol spikes = nervous system chaos.
Pets don’t get “hangry.” They get reactive, clingy, restless, and unable to settle.
A dog who can’t relax isn’t stubborn. A cat who wakes you at 3am isn’t rude. A pet who guards toys isn’t “dominant.”
They’re metabolically unstable.
Kibble Creates a Monoculture and Monocultures Create Anxiety
Dogs and cats evolved to eat prey. Not starch. Not fillers. Not synthetic vitamins sprayed on extruded pellets.
Kibble creates:
  • Low microbial diversity
  • High inflammatory load
  • High glycemic swings
  • Low omega‑3 intake
  • High omega‑6 intake
  • Chronic dehydration
This combination is the perfect recipe for a dysregulated nervous system.
A pet who can’t settle is not “high energy.” They’re inflamed.
A pet who can’t focus isn’t “stubborn.” They’re metabolically unstable.
A pet who panics when you leave isn’t “clingy.” They’re in sympathetic overdrive.
3. Gut Inflammation Shows Up as Behavior Before It Shows Up as Poop
This is the part that blows people’s minds.
Gut inflammation in pets often looks like:
  • Licking paws
  • Chewing hotspots
  • Scooting
  • Ear infections
  • Itching
  • Gas
  • “Random” aggression
  • Sudden fearfulness
  • Compulsive licking of floors, blankets, or you
These are gut-brain axis symptoms, not quirks.
Your pet isn’t dramatic. Their vagus nerve is overwhelmed.
Gut Inflammation Hijacks the Nervous System
Inflammation in the gut doesn’t stay in the gut.
It travels through:
  • The vagus nerve
  • Cytokine signaling
  • Microbial metabolites
  • Cortisol pathways
  • Blood‑brain barrier permeability
This is why gut inflammation shows up as:
  • Barking at every sound
  • Startling easily
  • Guarding toys or food
  • Sudden fear of strangers
  • Aggression “out of nowhere”
  • Difficulty calming down
  • Pacing
  • Nighttime restlessness
  • Over‑attachment
  • Destructive behavior
Your pet isn’t “acting out.” Their immune system is talking to their brain.
4. The Gut - Brain Axis: The Highway of Mood, Learning & Trust
90% of serotonin is made in the gut. Microbes produce GABA and dopamine precursors. Inflammation reduces neuroplasticity.
Translation:
  • Harder to train
  • Harder to calm
  • Harder to adapt
  • Harder to trust
  • Harder to feel safe
A dysregulated gut creates a dysregulated nervous system.
A dysregulated nervous system creates a dysregulated pet.
The Gut - Brain Axis: The Real Behavior Center
The gut and brain are in constant conversation.
When the gut is inflamed, the brain receives signals that say:
  • “We are unsafe.”
  • “We are under threat.”
  • “We need to be hyperalert.”
  • “We cannot relax.”
  • “We cannot learn.”
This is why training fails when physiology is dysregulated.
You can’t train a brain that’s receiving danger signals from the gut.
You have to calm the gut first.
5. Early Clues the Gut Is Running the Show
If you see any of these, the gut is waving a flag:
  • Soft stool or mucus
  • Red paws
  • Ear infections
  • Itching
  • Bad breath
  • Gas
  • Picky eating
  • Vomiting bile
  • Eating grass
  • “Nervous” personality
  • Reactivity
  • Compulsive behaviors
These are physiology, not personality.
The Early Warning Signs (Before the Poop Changes)
Most pet parents wait for diarrhea to think “gut issue.”
But the gut whispers long before it screams.
Early gut‑brain clues:
  • Red paws
  • Licking paws
  • Chewing hotspots
  • Ear infections
  • Itching
  • Gas
  • Bad breath
  • Soft stool
  • Eating grass
  • Vomiting bile
  • Picky eating
  • Sudden fearfulness
  • Reactivity
  • Compulsive licking
  • “Nervous” personality
  • Difficulty settling
  • Over‑attachment
  • Nighttime pacing
These are gut symptoms wearing behavioral costumes.
6. Nutrition: The Fastest Way to Change Behavior
You don’t need to overhaul everything. You just need to stop feeding the inflammation.
Principles, not prescriptions:
  • Add moisture (pets are chronically dehydrated)
  • Add fresh protein
  • Add omega‑3s
  • Rotate foods
  • Reduce ultra‑processed kibble
  • Avoid artificial colors, preservatives, fillers
Behavior changes shockingly fast when the gut calms down.
You don’t need a perfect diet. You need a less inflammatory one.
Functional medicine principles:
  • Add moisture (hydration = calmer nervous system)
  • Add fresh protein (amino acids = neurotransmitters)
  • Add omega‑3s (anti‑inflammatory)
  • Rotate foods (microbial diversity)
  • Reduce ultra‑processed kibble
  • Avoid artificial colors, preservatives, fillers
Behavior changes shockingly fast when inflammation drops.
7. Hidden Gut Disruptors in Your Home
These hit harder than people expect:
  • Lawn chemicals
  • Scented candles
  • Cleaning products
  • Flea/tick meds
  • Over‑vaccination
  • Chronic boredom
  • Lack of enrichment
  • Unpredictable routines
  • Noise pollution
  • Emotional stress in the home
Your pet’s gut is responding to your environment as much as their food.
These alter the microbiome, immune tone, and nervous system.
HOW FUNCTIONAL MEDICINE HANDLES GUT‑DRIVEN PET BEHAVIOR
Functional medicine doesn’t start with the behavior. It starts with the biology that produces the behavior.
Traditional veterinary behavior work often begins at the brain: training, conditioning, medication, enrichment.
Functional medicine begins at the gut-immune-neuroendocrine network and asks:
What physiological state is this animal living in that makes this behavior adaptive?
Because behavior is never random. It’s a biological strategy.
Here’s the functional medicine workflow.
1. Identify the Physiological Pattern, Not the Symptom
Functional medicine doesn’t treat:
  • reactivity
  • anxiety
  • compulsive licking
  • guarding
  • hypervigilance
It asks:
  • Is this sympathetic dominance?
  • Is this immune activation?
  • Is this microbial imbalance?
  • Is this blood sugar volatility?
  • Is this chronic inflammation?
  • Is this vagal under‑tone?
Behavior is the output of these patterns.
2. Map the Gut - Brain Axis First
Functional medicine assumes the gut is the primary driver until proven otherwise.
It evaluates:
  • stool quality
  • frequency
  • mucus
  • gas
  • burping
  • bile vomiting
  • grass eating
  • paw licking
  • hotspots
  • ear infections
  • appetite changes
  • picky eating
  • food sensitivities
  • hydration status
These are gut flags, not “quirks.”
If the gut is inflamed, the brain is inflamed. If the brain is inflamed, behavior shifts.
3. Reduce Inflammatory Load Before Touching Behavior
Functional medicine knows you can’t train a dysregulated nervous system.
So the first step is calming the physiology:
  • reduce inflammatory foods
  • increase moisture
  • add omega‑3s
  • remove artificial additives
  • rotate proteins
  • support microbial diversity
  • reduce environmental toxins
  • stabilize blood sugar
When inflammation drops, behavior often improves without any training changes.
4. Regulate the Nervous System Through the Gut
Functional medicine sees the gut as the remote control for the nervous system.
It supports:
  • vagal tone
  • parasympathetic recovery
  • stress resilience
  • sleep quality
  • cortisol rhythm
  • neuroplasticity
Tools include:
  • sniff walks (vagal stimulation)
  • predictable routines
  • chewing (self‑soothing)
  • enrichment that reduces sympathetic load
  • reducing overstimulation
  • stabilizing feeding windows
This creates a brain that can actually learn and adapt.
5. Look for Subclinical Patterns Vets Often Miss
Functional medicine is obsessed with early patterns, not late pathology.
It looks for:
  • chronic low‑grade inflammation
  • immune overactivation
  • histamine load
  • dysbiosis
  • metabolic instability
  • oxidative stress
  • hepatic overload
  • environmental toxicants
  • autonomic imbalance
These are the drivers of behavior, not the behavior itself.
6. Treat Behavior as a Biological Language
Functional medicine reframes behavior as:
  • a stress signal
  • an immune signal
  • a metabolic signal
  • a microbial signal
  • a vagal signal
  • a safety signal
A dog who guards food isn’t “dominant.” They’re living in a physiology that says resources are scarce.
A cat who hides isn’t “antisocial.” They’re living in a physiology that says the environment is unsafe.
A dog who can’t settle isn’t “high energy.” They’re living in a physiology that says the body is inflamed.
Functional medicine asks:
What is this behavior protecting the animal from?
What is the physiology trying to survive?
7. Build a Plan That Restores Capacity, Not Suppresses Symptoms
Functional medicine doesn’t chase symptoms. It restores capacity:
  • digestive capacity
  • immune tolerance
  • metabolic flexibility
  • nervous system resilience
  • microbial diversity
  • detoxification capacity
  • emotional regulation
When capacity returns, behavior normalizes.
Not because you “fixed the behavior.” But because you fixed the biology that made the behavior necessary.
8. The Functional Medicine Outcome
When you approach pet behavior through functional medicine, you get:
  • calmer baseline
  • better sleep
  • improved trainability
  • reduced reactivity
  • fewer compulsive behaviors
  • more predictable mood
  • better digestion
  • fewer skin issues
  • stronger immune resilience
  • a pet who feels safe in their body
A regulated gut creates a regulated brain
FUNCTIONAL MEDICINE VS TRADITIONAL VETERINARY MEDICINE
Two different frameworks. One shared goal: a regulated, healthy animal.
This isn’t about “better vs worse.” It’s about scope.
Traditional veterinary medicine excels at diagnosing and treating disease. Functional medicine excels at identifying and correcting dysregulation long before it becomes disease.
When it comes to gut‑driven behavior, the difference in approach is dramatic.
1. WHERE EACH MODEL STARTS
Traditional Veterinary Medicine
Starts with the presenting symptom:
  • barking
  • reactivity
  • anxiety
  • itching
  • GI upset
  • aggression
  • compulsive licking
Goal: Identify a diagnosis and apply a treatment.
Functional Medicine
Starts with the physiological pattern:
  • sympathetic dominance
  • dysbiosis
  • immune activation
  • blood sugar volatility
  • vagal under‑tone
  • chronic inflammation
Goal: Identify the root driver and restore systemic regulation.
2. HOW EACH MODEL VIEWS THE GUT
Traditional Veterinary Medicine
The gut is a digestive organ. It becomes relevant when:
  • diarrhea
  • vomiting
  • weight loss
  • abnormal labs
  • IBD
  • parasites
If the stool looks normal, the gut is often considered “fine.”
Functional Medicine
The gut is a neuroimmune organ. It becomes relevant when:
  • reactivity
  • anxiety
  • compulsive behaviors
  • chronic itching
  • ear infections
  • paw licking
  • picky eating
  • sleep disruption
  • “sensitive” temperament
If behavior is abnormal, the gut is suspect #1.
3. HOW EACH MODEL INTERPRETS BEHAVIOR
Traditional Veterinary Medicine
Behavior is:
  • temperament
  • training
  • environment
  • genetics
  • anxiety
  • dominance (older model)
Interventions:
  • training
  • behavior modification
  • anxiolytics
  • environmental enrichment
Functional Medicine
Behavior is:
  • immune tone
  • microbial signaling
  • metabolic stability
  • vagal function
  • neuroinflammation
  • endocrine balance
Interventions:
  • reduce inflammatory load
  • stabilize blood sugar
  • improve microbial diversity
  • support vagal tone
  • reduce toxicants
  • restore metabolic flexibility
Behavior is treated as a biological language, not a personality flaw.
4. HOW EACH MODEL HANDLES “SUBCLINICAL” SIGNS
Traditional Veterinary Medicine
If labs are normal and no pathology is found, symptoms are often labeled:
  • idiopathic
  • behavioral
  • stress‑related
  • “normal for the breed”
  • “quirky”
Functional Medicine
Subclinical signs are early warning systems:
  • paw licking
  • hotspots
  • ear infections
  • soft stool
  • gas
  • grass eating
  • bile vomiting
  • picky eating
  • reactivity
  • compulsive licking
  • difficulty settling
These are treated as physiological clues, not noise.
5. HOW EACH MODEL APPROACHES THE NERVOUS SYSTEM
Traditional Veterinary Medicine
Focuses on:
  • anxiolytics
  • antidepressants
  • sedatives
  • training
  • environmental modification
Goal: Reduce symptoms.
Functional Medicine
Focuses on:
  • vagal tone
  • parasympathetic recovery
  • cortisol rhythm
  • neuroplasticity
  • inflammatory signaling
  • microbial metabolites
Goal: Restore capacity.
A regulated gut = regulated nervous system = regulated behavior.
6. HOW EACH MODEL USES NUTRITION
Traditional Veterinary Medicine
Nutrition is:
  • prescription diets
  • hypoallergenic diets
  • weight management formulas
  • GI formulas
Focus: Manage symptoms.
Functional Medicine
Nutrition is:
  • a tool to modulate inflammation
  • a way to stabilize blood sugar
  • a method to diversify the microbiome
  • a lever for neurochemical balance
  • a foundation for immune tolerance
Focus: Change the physiology that produces the symptoms.
7. THE OUTCOME DIFFERENCE
Traditional Veterinary Medicine
You get:
  • symptom management
  • diagnosis‑based treatment
  • medication when needed
  • training support
  • acute care excellence
Functional Medicine
You get:
  • calmer baseline
  • improved trainability
  • fewer compulsive behaviors
  • reduced reactivity
  • better sleep
  • fewer skin issues
  • more predictable mood
  • stronger immune resilience
Not because behavior was “fixed.” But because the biology that created the behavior was corrected.
8. THE REAL TRUTH: THEY’RE NOT COMPETING MODELS
Functional medicine doesn’t replace veterinary medicine. It completes it.
Traditional medicine treats disease. Functional medicine prevents it.
Traditional medicine manages symptoms. Functional medicine explains them.
Traditional medicine stabilizes crises. Functional medicine stabilizes systems.
Together, they create the kind of outcomes pet parents dream of.
I'M MAKING A BIG ANNOUNCEMENT THIS WEEKEND! STAY TUNED!
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2 comments
Dr. Peninah Wood Ph.D
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Friday Insight: Why Your Pets Act the Way They Do
Simcha Healthcare
skool.com/simcha-healthcare-3222
Helping people optimize health, energy, mindset, and wellness by addressing root causes through Functional, Nutritional and Holistic Medicine.
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