Canine Science

Long Haired Weiner Dogs: The Science Behind Their Unique Coat

Explore the genetics, evolution, and care science behind long haired weiner dogs. Learn why their coat developed and what it means for daily care.

By Tom Renshaw · Published 27 May 2026

Long Haired Weiner Dogs: The Science Behind Their Unique Coat

Why Do Long Haired Weiner Dogs Have Long Coats?

Long haired weiner dogs (Dachshunds) carry a recessive variant of the FGF5 gene (Fibroblast Growth Factor 5) that extends the anagen (growth) phase of the hair follicle cycle. This genetic mutation originated from selective breeding in 19th-century Germany, where longer coats provided additional protection against cold, wet underbrush during badger and fox hunting. Unlike smooth-coated Dachshunds, long haired weiner dogs require 3-5 brushing sessions per week and professional grooming every 8-12 weeks to prevent matting.

The Genetics of Long Hair in Dachshunds

The long coat trait in Dachshunds traces to a specific mutation in the FGF5 gene on canine chromosome 32. Research published in the Proceedings of the National Academy of Sciences identified that dogs carrying two copies of the recessive "long-hair" allele produce hair shafts that grow significantly longer before the follicle enters the telogen (resting) phase.

How FGF5 Controls Coat Length

The FGF5 protein acts as a signaling molecule that tells hair follicles when to stop growing and enter the resting phase. When both copies of the gene carry the mutation, FGF5 signaling is reduced, allowing the anagen phase to extend from the typical 30-60 days (in smooth coats) to 90-120+ days. This means each hair strand grows roughly 2-3 times longer before shedding.

In practical terms: a smooth-coated Dachshund's body hair reaches approximately 0.5-1 inch, while a long haired weiner dog's body hair typically grows 3-5 inches, with ear fringe reaching 6-8 inches.

Genotype Combinations and Breeding Outcomes

Parent 1	Parent 2	Puppy Coat Outcomes
Long hair (ll)	Long hair (ll)	100% long hair
Long hair (ll)	Smooth (LL)	100% smooth carriers
Smooth carrier (Ll)	Smooth carrier (Ll)	25% long, 50% smooth carriers, 25% smooth non-carriers
Smooth carrier (Ll)	Long hair (ll)	50% long hair, 50% smooth carriers

The "L" represents the dominant short-hair allele; "l" represents the recessive long-hair allele. Only dogs with the "ll" genotype express the long coat phenotype. This is why two smooth-coated Dachshunds can produce long-haired puppies if both carry the recessive gene — something that surprises many owners.

Evolutionary Context: Why Longer Coats Were Selected

From Forest Hunting to Lap Companions

Original Dachshunds were bred in Germany as early as the 15th century to hunt badgers ("Dachs" = badger, "Hund" = dog). The smooth-coated variety was standard, but as hunters worked in colder, wetter regions — particularly pursuing foxes through dense underbrush and briar — dogs with longer, water-resistant coats had a survival and working advantage.

The long-haired variety likely emerged from crosses with spaniel-type breeds (possibly the German Stöberhund or early setter types) during the 17th-18th centuries. The resulting longer coat provided:

Thermal insulation: Trapped air between longer guard hairs and a dense undercoat maintained body temperature in cold burrows
Abrasion protection: Longer fringe on ears, chest, and legs shielded skin from thorns and brambles
Water resistance: Longer outer coat shed moisture more effectively during wet-weather hunts

This contrasts with the wire-haired Dachshund, which was developed through terrier crosses for a completely different protective strategy — a harsh, wiry topcoat that resisted snagging.

Physiology of the Long Haired Weiner Dog Coat

Understanding the coat structure explains both the grooming needs and the shedding patterns owners experience.

Double Coat Architecture

Long haired weiner dogs possess a double coat consisting of:

Guard hairs (outer coat): Longer, coarser hairs (3-5 inches on body, 6-8 inches on ears/chest/legs) that repel water and protect against UV radiation
Undercoat: Shorter, denser, softer hairs (1-2 inches) that provide insulation by trapping air close to the skin

The undercoat sheds seasonally — typically in spring (March-May) and fall (September-November) — while guard hairs shed more gradually year-round. During peak shedding seasons, owners report 2-3 times the normal hair loss.

Hair Follicle Cycle Phases

Phase	Duration (Long Hair)	Duration (Smooth)	What's Happening
Anagen (growth)	90-120+ days	30-60 days	Hair actively growing from follicle
Catagen (transition)	14-21 days	14-21 days	Follicle shrinks, growth stops
Telogen (resting)	60-90 days	60-90 days	Hair rests before shedding
Exogen (shedding)	Variable	Variable	Old hair releases, new anagen begins

The extended anagen phase is why long haired weiner dogs never look "shaved down" naturally — their hair simply grows longer before cycling out. This also means mats form more easily: when loose hairs in telogen/exogen phase don't shed cleanly, they tangle with actively growing anagen hairs.

Practical Care Implications for Owners

Daily and Weekly Grooming Requirements

Based on coat physiology, here's what long haired weiner dog owners should plan for:

Brushing Schedule

Minimum: 3 sessions per week, 10-15 minutes each
Ideal: Daily 5-10 minute sessions to prevent mats
Shedding season (spring/fall): Daily 15-20 minutes with an undercoat rake

Tool Recommendations by Coat Region

Body Area	Tool	Frequency	Price Range (2026)
Body/back	Slicker brush (medium pin)	3x/week	$15-$35
Undercoat (seasonal)	Undercoat rake or deshedding tool	2x/week in season	$20-$45
Ear fringe	Wide-tooth comb	Daily	$8-$20
Leg feathering	Pin brush	3x/week	$12-$28
Chest/belly	Slicker brush + comb	3x/week	$15-$35

Professional Grooming

Frequency: Every 8-12 weeks for sanitary trims, ear cleaning, and thorough dematting
Cost: $50-$85 per session (varies by region and groomer experience with Dachshunds)
Annual cost: $200-$510 depending on frequency

Bathing

Bathe every 4-6 weeks using a dog-specific shampoo (pH 6.5-7.5, not human shampoo at pH 5.5). Over-bathing strips natural sebum from guard hairs, increasing brittleness and tangling. After bathing, blow-dry on cool/warm setting while brushing — air-drying long Dachshund coats almost guarantees mat formation at the undercoat level.

Nutrition and Coat Health

Coat quality directly reflects nutritional status. Long haired weiner dogs need:

Omega-3 fatty acids (EPA/DHA): 50-100 mg per kg of body weight daily. For a standard 20 lb (9 kg) Dachshund, this is 450-900 mg/day. Sources: fish oil supplements or foods with named fish ingredients
Omega-6 fatty acids (linoleic acid): Minimum 5.5% of diet dry matter (per AAFCO adult maintenance standards)
Protein: Minimum 22% dry matter basis for coat keratin synthesis. Look for named animal protein (chicken, salmon, lamb) as first ingredient
Zinc: 120 mg/kg of diet dry matter — deficiency causes dull, brittle coats and increased shedding

Common Misconceptions About Long Haired Weiner Dogs

Myth	Fact
"Long haired Dachshunds are hypoallergenic"	No Dachshund coat type is hypoallergenic. Allergens come from dander (skin flakes) and saliva, not hair length. Long coats may actually trap more environmental allergens.
"You should shave them in summer to keep them cool"	Shaving a double coat destroys its insulating structure. The undercoat actually helps regulate temperature by trapping cool air. Shaved dogs are MORE prone to overheating and sunburn. Only shave for medical procedures.
"Long haired weiner dogs shed less than smooth coats"	They shed comparable amounts annually — but the longer hairs are more visible on furniture and clothing. During seasonal blows, long hair shedding is more dramatic.
"Long hair means they don't need sweaters in winter"	Dachshunds have minimal body fat and long spines close to the ground. Even long-haired varieties benefit from coats when temperatures drop below 40°F (4°C), especially on wet/windy days.
"Their hair grows continuously like human hair"	Dog hair cycles through growth phases and sheds. It doesn't grow infinitely — it reaches a genetically determined length and then cycles out. Long hair just has a longer growth phase, not infinite growth.

Health Conditions Linked to Coat Type

While coat length itself doesn't cause disease, the long coat creates environments where certain conditions thrive:

Ear Infections (Otitis Externa)

Long ear fringe reduces airflow to the ear canal, creating warm, humid conditions where yeast (Malassezia) and bacteria proliferate. Long haired weiner dogs have an estimated 2-3x higher rate of ear infections compared to smooth-coated Dachshunds.

Prevention: Weekly ear cleaning with a veterinarian-approved ear cleanser; keep ear fringe trimmed to allow airflow
Warning signs: Head shaking, ear odor, brown/waxy discharge, scratching at ears
Treatment cost: $50-$150 per veterinary visit; chronic cases can exceed $500

Hot Spots (Acute Moist Dermatitis)

Matted coat traps moisture against skin, creating bacterial breeding grounds. Hot spots appear as red, oozing, painful lesions — often on the neck, hips, or behind ears where mats commonly form.

Prevention: Regular brushing to prevent mats; thorough drying after baths/swimming
When to see the vet: Any moist, red, rapidly expanding skin lesion requires veterinary treatment (typically antibiotics and anti-inflammatory medication)

Intervertebral Disc Disease (IVDD) — Grooming-Related Risk

This isn't caused by the coat itself, but long haired weiner dogs require more handling during grooming. Improper lifting (grabbing under the armpits without supporting the hindquarters) increases spinal stress. Dachshunds are 10-12x more likely to develop IVDD than other breeds, with 1 in 4 Dachshunds experiencing disc problems in their lifetime.

Safe handling: Always support both chest AND hindquarters when lifting. Keep spine horizontal.
Groomer communication: Instruct groomers on proper Dachshund handling; consider mobile groomers who work with the dog on the floor rather than elevated tables

When Coat or Skin Changes Signal a Problem

Consult your veterinarian if your long haired weiner dog shows:

Sudden patchy hair loss (alopecia) — could indicate hypothyroidism, Cushing's disease, or mange
Coat becoming dry, brittle, or dull despite proper nutrition — possible metabolic disease
Excessive shedding outside seasonal periods — stress, illness, or nutritional deficiency
Skin thickening, darkening, or odor — yeast or bacterial infection
Symmetric hair loss on flanks — may indicate color dilution alopecia or hormonal imbalance

Remember: Coat changes often precede other clinical signs by weeks or months. Early veterinary evaluation catches underlying conditions when they're most treatable.

How Does This Compare to Other Long-Haired Breeds?

Breed	Coat Gene	Coat Length	Shedding Level	Grooming Frequency
Long Haired Dachshund	FGF5 recessive	3-5" body, 6-8" fringe	Moderate-high (seasonal)	3-5x/week brushing
Long Haired German Shepherd	FGF5 recessive	2-4" body, longer ruff	High (year-round + seasonal)	Daily
Shih Tzu	Different mutation (unknown specific gene)	Continuous growth to floor length	Low (hair vs. fur)	Daily + professional monthly
Afghan Hound	Multiple genes, breed-specific	Very long, fine, silky	Low-moderate	Daily 30+ minutes

The long haired weiner dog's coat is moderate-maintenance compared to other long-haired breeds — it doesn't grow continuously like a Shih Tzu's, but requires more attention than a smooth Dachshund. For owners willing to commit 30-45 minutes per week to grooming, the long coat is manageable without professional help for routine maintenance.

Frequently Asked Questions

Is the long coat normal for Dachshunds, or is it a defect?

The long coat is a recognized, standard variety within the Dachshund breed. The American Kennel Club recognizes three coat types: smooth, long-haired, and wire-haired. All three are equally "normal" and can appear in the same litter if parents carry the appropriate genes. The long coat is not a defect — it's a stable, heritable trait that's been selectively maintained for over 200 years.

Can long haired weiner dogs handle cold weather better than smooth coats?

Marginally, yes — the longer guard hairs and denser undercoat provide additional insulation. However, Dachshunds of all coat types are poorly suited to extended cold exposure due to their low body fat, short legs (belly close to cold ground), and long spines. Below 40°F (4°C), a fitted dog coat is recommended regardless of coat type. Below 20°F (-7°C), limit outdoor time to bathroom breaks only.

How do I know if my Dachshund puppy will have long hair?

Long hair is usually apparent by 3-4 weeks of age — puppies develop visible fringe on ears and longer body coat compared to smooth littermates. However, some long-haired puppies look nearly smooth until 8-12 weeks. Genetic testing (available through companies like Embark or Wisdom Panel for $80-$200) can confirm the FGF5 genotype if visual identification is uncertain.

Do long haired weiner dogs have different temperaments than smooth coats?

There's no scientific evidence linking coat type to temperament in Dachshunds. Temperament is influenced by genetics (parental behavior), early socialization, training, and individual personality. However, some breeders anecdotally report that long-haired lines — which historically included spaniel crosses — may be slightly calmer than some smooth-coated lines. This is breed-line specific, not coat-type specific.

What does it mean when my long haired Dachshund's coat suddenly changes texture?

Sudden coat texture changes (becoming wiry, cottony, or brittle) often signal an underlying health issue. Hypothyroidism commonly causes dry, coarse coats. Cushing's disease (hyperadrenocorticism) produces thin, fragile skin with sparse, fine hair. Nutritional deficiencies can make coats dull and brittle. Any rapid coat change warrants veterinary evaluation — schedule an appointment within 1-2 weeks.

Is it normal for my long haired weiner dog to shed clumps during certain seasons?

Yes — seasonal "coat blow" in spring and fall is normal for double-coated dogs. You may see handfuls of undercoat release during brushing. This is healthy and expected. What's NOT normal: bald patches, skin redness, excessive scratching, or coat loss outside seasonal periods. If shedding seems excessive or asymmetric, consult your veterinarian to rule out allergies, parasites, or endocrine disease.