Where the Red Fern Grows Dogs: Coonhound Scent Tracking
Explore the canine science behind the dogs in Where the Red Fern Grows — how coonhounds track scent, their evolutionary biology, and what it means for owners.
The dogs in Where the Red Fern Grows are Redbone Coonhounds and Bluetick Coonhounds — breeds specifically developed for nocturnal raccoon hunting using scent-tracking abilities that surpass most other dog breeds. Their olfactory system contains up to 300 million scent receptors (compared to roughly 6 million in humans), and their long, pendulous ears serve a functional purpose: trapping and directing scent molecules toward the nose. These coonhound breeds process odor through a specialized vomeronasal organ and an olfactory bulb that is proportionally 40 times larger than the human equivalent, enabling them to follow scent trails that are hours or even days old across miles of rough terrain.
Wilson Rawls' 1961 novel Where the Red Fern Grows introduced millions of readers to the world of coonhound hunting through the beloved characters Old Dan and Little Ann. But beyond the emotional story lies a fascinating showcase of canine sensory biology. The two dogs in the novel — a Redbone Coonhound and a Bluetick Coonhound — represent centuries of selective breeding for one of the most demanding scent-work tasks in the dog world: tracking nocturnal prey through dense Ozark forest at night, without visual cues.
If you've ever wondered what makes these dogs tick, why they bay instead of bark, or whether their legendary tracking abilities hold up under scientific scrutiny, this guide breaks down the biology, evolution, and practical reality of owning a coonhound-type dog.
The Olfactory Machinery: How Coonhounds Process Scent
The Numbers Behind the Nose
A coonhound's scent-tracking system operates on a scale that dwarfs human capability at every level:
- Olfactory receptors: 250–300 million (humans have ~6 million)
- Olfactory bulb ratio: Approximately 40x larger relative to total brain size compared to humans
- Scent discrimination: Can distinguish individual odor components within complex scent mixtures at concentrations as low as parts per trillion
- Vomeronasal organ (Jacobson's organ): A secondary scent-processing structure in the roof of the mouth that detects pheromones and non-volatile chemical compounds
- Airflow architecture: Slit-like nostrils allow continuous inhalation while exhaling through the sides, maintaining a constant stream of scent-laden air over the olfactory epithelium
The physiological mechanism works like this: when a coonhound puts its nose to the ground, air enters through the central portion of the nostrils and flows over the olfactory turbinates — bony, scroll-like structures covered in millions of receptor cells. Each receptor cell expresses one type of odorant receptor protein, and when a scent molecule binds to a matching receptor, it triggers a neural signal directly to the olfactory bulb. From there, signals are routed to the piriform cortex (for odor identification), the amygdala (for emotional association), and the entorhinal cortex (for spatial memory).
What makes coonhounds particularly remarkable is their ability to perform stereo olfaction — they can determine the direction of a scent trail by comparing odor concentration between their left and right nostrils independently. Research published in the journal Nature Communications demonstrated that dogs use this bilateral comparison to orient toward scent sources, much like how we use two ears to localize sound.
| Capability | Coonhounds (Redbone/Bluetick) | Bloodhounds | German Shepherds | Humans |
|---|---|---|---|---|
| Olfactory receptors (approx.) | 250–300 million | ~300 million | ~225 million | ~6 million |
| Oldest trackable trail age | 24–48 hours | Up to 300 hours (12+ days) | 12–24 hours | Minutes (strong odors) |
| Effective tracking distance | 5–20 miles per night | Up to 130 miles | 3–10 miles | N/A |
| Vomeronasal organ | Highly developed | Highly developed | Moderate | Vestigial |
| Stereo olfaction | Yes | Yes | Yes | No |
Evolutionary Roots: From Wolf Pack Hunters to Night Trackers
Why Scent Tracking Evolved
The ancestral wolf (Canis lupus) was primarily a cursorial predator — hunting by sight and stamina, chasing prey across open terrain. But wolves also used scent to locate cached food, track wounded prey, and navigate territory boundaries. This baseline olfactory ability was the raw material that humans shaped over thousands of years of domestication.
Scent hounds as a category emerged in medieval Europe, where dense forests made sight-based hunting impractical. Hunters selectively bred dogs that could follow ground scent over long distances while vocalizing — the characteristic bay — so the hunter could follow on foot. Coonhounds specifically developed in the American South and Appalachia from a mix of English Foxhounds, Bloodhounds, and other European scent hounds brought by colonists, then further refined for the unique demands of nocturnal raccoon hunting in hardwood forests.
The evolutionary logic of the coonhound's traits becomes clear when you map each physical feature to its functional purpose:
- Long, drooping ears: Not decorative — they act as scent scoops, brushing the ground and directing odor particles upward toward the nose as the dog moves. A study in the Merck Veterinary Manual notes that the ear length in scent hounds correlates with ground-scenting efficiency.
- Loose, wrinkled skin (especially in Blueticks): Traps scent molecules near the face, extending the time available for olfactory processing.
- Deep chest and large lung capacity: Supports sustained aerobic activity over hours of tracking — coonhounds routinely work 4–8 hour hunts covering 10–20 miles.
- Loud, resonant bay: Evolved from the wolf's howl but modified for continuous vocalization while running. The bay serves as an acoustic beacon so the human hunter can follow in darkness when visual tracking is impossible.
- Webbed feet (common in Redbones): Adaptation for crossing rivers and swamps during hunts, reflecting the aquatic environments where raccoons often flee.
Breed Breakdown: Old Dan, Little Ann, and Their Modern Relatives
In the novel, Little Ann is described as a smaller, more agile treeing dog, while Old Dan is the stronger, more determined tracker. This mirrors the real-world functional differences between the two primary coonhound breeds featured in the story:
| Trait | Redbone Coonhound | Bluetick Coonhound |
|---|---|---|
| Weight (male) | 55–70 lb (25–32 kg) | 55–80 lb (25–36 kg) |
| Weight (female) | 45–60 lb (20–27 kg) | 45–65 lb (20–29 kg) |
| Height at shoulder | 22–27 in (56–69 cm) | 22–27 in (56–69 cm) |
| Coat color | Solid red, mahogany | Dark blue mottled with black spots |
| Temperament | Even-tempered, eager to please | Determined, cold-nosed (older trails) |
| Tracking style | Faster, hot-nosed (fresher trails) | Slower, more methodical, persistent |
| AKC recognition year | 2009 | 2009 |
| Lifespan | 12–15 years | 11–12 years |
| Common health concerns | Hip dysplasia, progressive retinal atrophy | Hip dysplasia, bloat (GDV), ear infections |
The term "cold-nosed" versus "hot-nosed" refers to a dog's ability to follow older, fainter scent trails versus fresher ones. Blueticks earned their reputation as cold-nosed dogs because of their methodical, persistent tracking style — they'll work a 24-hour-old trail that a hot-nosed breed might abandon. This distinction matters for modern owners considering these breeds for activities like AKC coonhound events or recreational scent work.
The Bay: Why Coonhounds Vocalize and What It Means
One of the most distinctive — and for urban owners, most challenging — traits of coonhounds is their vocalization. Unlike a typical bark, the coonhound bay is a deep, drawn-out howl that can carry for over a mile in open terrain. This isn't random noise; it's a precisely timed communication behavior with specific triggers:
- Strike bay: A rapid, excited series of bays when the dog first picks up fresh scent. Signals to the hunter (and pack-mates) that a trail has been found.
- Track bay: A rhythmic, steady vocalization while actively following a scent trail. The frequency and pitch change as the trail gets hotter or colder.
- Tree bay: A distinctive, urgent, continuous vocalization when prey has been located in a tree. This is the "finish" signal.
- Lonesome bay/howling: A mournful, sustained howl often triggered by isolation, boredom, or hearing other dogs bay. This is the vocalization that gets coonhounds into trouble in suburban neighborhoods.
From a neuroscience perspective, bay vocalization is controlled by the periaqueductal gray (PAG) region of the midbrain, which coordinates emotional vocalizations across mammals. In coonhounds, selective breeding has amplified the neural pathways connecting olfactory stimulation to PAG activation — essentially, smelling prey triggers an involuntary vocal response. This is why training a coonhound not to bay is extraordinarily difficult; you're working against hardwired neurology, not a learned behavior.
Common Misconceptions About Coonhounds Debunked
| Myth | Scientific Fact |
|---|---|
| "Coonhounds are dumb — they can't learn tricks." | Coonhounds score as independent thinkers, not low-intelligence dogs. They were bred to make autonomous decisions miles from their handler. This independence looks like stubbornness in obedience contexts but reflects specialized cognitive wiring. They excel at scent discrimination tasks that would overwhelm other breeds. |
| "They need to hunt to be happy." | Coonhounds need intense olfactory stimulation and vigorous exercise — but this can be satisfied through scent work games, tracking sports, barn hunt, or structured nose work classes. Hunting is not required, but mental stimulation through scent is non-negotiable. |
| "Redbones and Blueticks are aggressive because they hunt." | Prey drive and aggression toward humans or other dogs are separate behavioral systems. Well-socialized coonhounds are typically gentle and affectionate with people. Their prey drive is directed specifically at small animals and is a pursuit-and-tree behavior, not a kill behavior. |
| "You can't train a coonhound off-leash." | With consistent positive reinforcement training, coonhounds can develop reliable recall — but it requires significantly more proofing against scent distractions than with biddable breeds like Border Collies. GPS tracking collars (such as the Garmin Alpha 300, ~$600) are recommended for any off-leash work in unfenced areas. |
| "The long ears cause constant ear infections." | While pendulous ears do increase infection risk by reducing airflow, regular weekly cleaning with a veterinary-approved ear wash (e.g., Epi-Otic Advanced, ~$18/bottle) and keeping ears dry after swimming reduces infection rates dramatically. Not all coonhounds develop chronic ear issues. |
Practical Implications: Living With a Coonhound in 2026
What This Science Means for Your Daily Life
Exercise requirements: Plan for 60–90 minutes of vigorous activity daily. A 20-minute leash walk will not satisfy a coonhound. They need sustained aerobic exercise (running, hiking, biking with a proper springer attachment) combined with scent-based mental work.
Scent enrichment on a budget: Drag a treat-filled sock across your yard to create scent trails. Hide kibble in snuffle mats ($15–$30). Use frozen Kong toys stuffed with peanut butter to engage their nose and tongue simultaneously. AKC Scent Work trials cost roughly $25–$40 per entry and give coonhounds a structured outlet for their olfactory drive.
Fencing: Minimum 6-foot fence, ideally with a lean-in or coyote roller at the top. Coonhounds are athletic climbers and diggers when motivated by scent. Underground electric fences are ineffective — a coonhound following a strong scent trail will push through the correction without hesitation.
Vocalization management: If you live in a neighborhood with close neighbors, a coonhound may not be the right fit. Their bay can reach 90+ decibels. For existing coonhound owners, addressing the root cause (boredom, isolation, scent stimulation from wildlife) is more effective than trying to suppress the behavior through punishment.
First-year cost estimate: Purchase from a responsible breeder: $800–$1,500. Annual veterinary care (including heartworm prevention, vaccinations, ear care): $600–$1,200. High-quality food (40–60 lb dog eating ~3 cups/day): $600–$900/year. Fencing, crate, GPS collar, and gear: $500–$1,500 initial investment.
When Scent-Driven Behavior Signals a Problem
While intense scent focus is normal for coonhounds, certain changes in olfactory behavior can indicate medical issues requiring veterinary attention:
Red Flags: Consult Your Veterinarian If You Notice
- Sudden loss of interest in scent/tracking: Can indicate nasal tumors, dental disease affecting the vomeronasal organ, or cognitive dysfunction syndrome (canine dementia) in senior dogs.
- Excessive, obsessive sniffing with inability to redirect: May signal canine compulsive disorder, particularly if the dog sniffs one spot for 30+ minutes without responding to name or treats.
- Sneezing, nasal discharge, or nosebleeds during tracking: Could indicate nasal mites (Pneumonyssoides caninum), fungal infection (aspergillosis), or foreign body lodged in the nasal passage.
- Head tilt combined with balance issues and ear odor: Suggests inner ear infection (otitis interna), which can disrupt both balance and scent processing.
- Appetite changes with altered sniffing behavior: Dogs with reduced olfaction often eat less because food becomes less appealing — similar to how humans lose appetite with a cold.
Always consult your veterinarian for proper diagnosis. These behavioral changes can have multiple causes that require professional evaluation, including bloodwork, imaging, or rhinoscopy.
How Coonhound Scent Processing Differs From Humans
Understanding the gap between human and coonhound olfaction isn't just academic — it fundamentally changes how you interact with your dog:
- Temporal resolution: Humans smell a room as one blended odor. A coonhound entering the same room can distinguish the sequence of who entered, when, and in what order — essentially "reading" time through scent layers.
- Individual identification: Where you smell "dog park," a coonhound can identify individual animals, their sex, reproductive status, stress levels, and health status from the chemical signatures they left behind.
- Emotional state detection: Research from the University of Naples (published in PLOS ONE) demonstrated that dogs can detect human emotional states through body odor alone, with accuracy rates above 80% for fear and happiness. Coonhounds, with their amplified olfactory hardware, likely exceed these baselines.
- Environmental mapping: A coonhound mentally maps its territory primarily through scent, not visual landmarks. This is why they can become disoriented if a familiar area is heavily altered (construction, new landscaping) even though it "looks" the same to us.
Frequently Asked Questions
Why do coonhounds howl instead of bark?
The bay is a selectively amplified version of the ancestral wolf howl, modified through centuries of breeding for continuous vocalization during pursuit. It serves as a long-distance acoustic beacon so human hunters can follow the dog in darkness. The neural circuit connecting olfactory stimulation to vocalization is more robust in coonhounds than in breeds selected for silence during work (like pointing breeds).
Can coonhounds track in the rain?
Yes — and often better than in dry conditions. Moisture helps volatile organic compounds (the molecules that create scent) stay closer to the ground rather than dissipating upward. Light rain and high humidity improve scent conditions. Heavy downpours can wash away ground scent, but coonhounds compensate by switching to air-scenting (lifting their nose to catch airborne molecules) rather than ground-scenting.
How do coonhounds know which tree the raccoon climbed?
They don't visually identify the tree. The raccoon's scent trail ends abruptly at the base of the tree (because the animal went vertical, leaving the ground). The coonhound circles the area, confirming the scent goes up but not out in any ground direction, and begins the tree bay. Some experienced coonhounds can even determine the height of the animal in the tree by the concentration gradient of scent drifting downward.
What does it mean when my coonhound ignores me during a walk?
When a coonhound locks onto an interesting scent, their brain's olfactory processing essentially overrides other sensory inputs — a phenomenon sometimes called "scent deafness." The dog isn't choosing to ignore you; their attentional resources are fully allocated to scent processing. This is why recall training for coonhounds requires extensive proofing with increasing scent distractions, and why off-leash work should only happen in secure areas or with GPS tracking.
Is excessive sniffing on walks normal?
Absolutely — and it should be encouraged. Sniffing is a coonhound's primary way of gathering information about their environment, and it provides significant mental stimulation. A 20-minute walk where your dog spends 15 minutes sniffing can be more mentally tiring than a 45-minute walk at a brisk pace with no sniffing. Allow structured sniff time as part of your daily routine.
Are Redbone Coonhounds good family dogs?
Well-bred, properly socialized Redbones are typically gentle, patient, and affectionate with children and other household pets. They rank well in temperament testing through the American Temperament Test Society. However, their exercise needs, vocalization volume, and strong prey drive toward small animals (cats, rabbits, squirrels) require an owner prepared to manage these traits proactively. They are best suited to homes with secure yards and active families.
References and Further Reading
- Craven, B.A., et al. "The fluid dynamics of canine olfaction." Journal of the Royal Society Interface, 2010.
- Merck Veterinary Manual — Redbone Coonhound Breed Profile
- American Kennel Club — AKC Redbone Coonhound Standard and AKC Bluetick Coonhound Standard
- Gábor, A., et al. "Dogs can discriminate emotional human body odor." PLOS ONE, 2018.
Marcus Aldridge
All our authors care for dogs every day — read more of their work on the authors page.
