Long Haired Weiner Dog Coat Science: Genetics, Grooming & Care
Discover the science behind the long haired weiner dog coat — FGF5 gene mutations, grooming needs, health risks, and practical care tips for owners.
Quick Answer: What Makes a Long Haired Weiner Dog Different?
The long haired weiner dog (longhaired Dachshund) carries a recessive mutation in the FGF5 (Fibroblast Growth Factor 5) gene that disrupts the hair growth cycle, allowing the coat to grow significantly longer than the smooth-coated variety. This mutation affects the transition from the anagen (growth) phase to the catagen (regression) phase of the hair follicle cycle, resulting in flowing, feathered fur that can reach 4–6 inches in length on the ears, chest, legs, and tail. Longhaired Dachshunds require brushing 3–4 times per week, professional grooming every 8–12 weeks ($50–$85 per session), and carry the same breed-predisposed health risks as all Dachshunds — particularly intervertebral disc disease (IVDD), which affects approximately 25% of the breed.
If you've ever wondered why some Dachshunds look like they're wearing a silky fringe while others are sleek and smooth, you're looking at canine genetics in action. The long haired weiner dog isn't a separate breed — it's one of three coat varieties within the Dachshund breed (smooth, longhaired, and wirehaired), each produced by distinct genetic mechanisms. Understanding the science behind that beautiful flowing coat helps you provide better care, anticipate health needs, and separate fact from fiction.
The Genetics Behind the Long Haired Dachshund Coat
The FGF5 Gene and Hair Length Regulation
Research published in the journal Science (Cadieu et al., 2009) identified that coat length in dogs is primarily controlled by three genes: FGF5, RSPO2, and KRT71. The FGF5 gene is the principal regulator of hair length across dog breeds.
In normal (short-coated) dogs, the FGF5 protein signals the hair follicle to stop growing and enter the catagen phase — essentially telling the hair "you're long enough, time to shed and restart." Longhaired Dachshunds carry a recessive loss-of-function mutation in FGF5 (specifically, a single nucleotide polymorphism that produces a non-functional protein). Without this stop signal, the hair follicle remains in the anagen (active growth) phase for a much longer period.
Because this mutation is recessive, a puppy must inherit two copies of the longhair allele (one from each parent) to express the long coat. Two smooth-coated Dachshunds that both carry one copy of the longhair allele can produce longhaired puppies — which is why longhaired pups occasionally appear in smooth-coated litters.
| Parent 1 Genotype | Parent 2 Genotype | Possible Puppy Coats | Longhair Probability |
|---|---|---|---|
| Smooth (S/S) | Smooth (S/S) | 100% Smooth | 0% |
| Smooth carrier (S/L) | Smooth carrier (S/L) | Smooth or Longhaired | 25% |
| Smooth carrier (S/L) | Longhaired (L/L) | Smooth or Longhaired | 50% |
| Longhaired (L/L) | Longhaired (L/L) | 100% |
S = short-hair allele (dominant), L = longhair allele (recessive). Genetic testing through labs like Embark or Wisdom Panel ($79–$199) can confirm carrier status before breeding.
Evolutionary Context: Where Did the Long Coat Come From?
Ancestral Origins of the Longhaired Dachshund
The original Dachshund — developed in Germany from at least the 15th century for badger hunting (Dachs = badger, Hund = dog) — was smooth-coated. The longhaired variety emerged through selective crossbreeding, likely in the 16th–17th centuries, when German hunters introduced spaniel-type dogs and possibly Irish Setters into Dachshund lines to produce a weather-resistant coat suited for hunting in cold, wet underbrush.
From an evolutionary biology perspective, longer coats in canids typically correlate with colder-climate adaptation. Wild canids in arctic and subarctic regions (like the Arctic fox or gray wolf subspecies in northern latitudes) develop denser, longer guard hairs as insulation. The FGF5 longhair mutation essentially mimics this natural cold-weather adaptation through artificial selection — breeders favored dogs whose coats provided better protection in harsh European winters.
The wirehaired variety was developed later by crossing with terrier breeds (likely the Dandie Dinmont Terrier) to produce a harsh, protective outer coat for hunting in thorny brush. Each coat type reflects a different functional selection pressure applied by human hunters.
How the Long Haired Weiner Dog Coat Actually Grows: The Physiology
Understanding the hair growth cycle explains why longhaired Dachshunds look the way they do — and why their grooming needs differ so dramatically from smooth coats.
The Canine Hair Growth Cycle
Every hair follicle on a dog's body cycles through three phases:
- Anagen (growth phase): The follicle actively produces hair. In short-coated breeds, this phase lasts roughly 30–60 days. In longhaired breeds with the FGF5 mutation, the anagen phase extends to several months or longer, allowing hair to grow to 4–6 inches before cycling.
- Catagen (transition phase): Growth stops, the follicle shrinks, and the hair root detaches from the blood supply. Lasts approximately 2–3 weeks.
- Telogen (resting/shedding phase): The old hair is eventually pushed out by a new anagen-phase hair. This is when shedding occurs.
In longhaired Dachshunds, different body regions have different anagen phase durations, which is why the coat isn't uniformly long. The ears, chest, underside, back of the legs, and tail have the longest anagen phases, producing the characteristic feathering. The back and head tend to have shorter hair — typically 1–2 inches — because follicles in those regions still cycle somewhat normally.
Coat Structure: Single vs. Double
Longhaired Dachshunds typically have a single coat with a slight undercoat — not the dense double coat you'd see on a Siberian Husky. The outer guard hairs are silky and slightly wavy (not curly), with a subtle sheen. This differs from wirehaired Dachshunds, who have a harsh, dense double coat with a distinctive beard and eyebrows.
According to the American Kennel Club breed standard, the longhaired Dachshund's coat should be "sleek, glistening, and often slightly wavy" — not woolly, which would indicate incorrect coat genetics.
Practical Care: What Longhaired Coat Science Means for Daily Life
Owner Action Plan: Longhaired Dachshund Coat Care
Brushing Schedule
- Frequency: 3–4 times per week minimum; daily during seasonal shedding (spring and fall)
- Tools: Pin brush for the body, steel comb for feathering areas (ears, legs, tail), slicker brush for any tangles
- Time commitment: 10–15 minutes per session
- Key areas: Behind the ears, armpits, and behind the rear legs — these are mat-prone zones that owners often miss
Bathing
- Frequency: Every 3–4 weeks (more frequent bathing strips natural oils from the longer coat, causing dryness and breakage)
- Products: Use a canine-specific moisturizing shampoo (pH 6.5–7.5, never human shampoo at pH 5.5). A conditioning spray after bathing helps prevent tangles.
- Estimated cost: $12–$25 for quality canine shampoo/conditioner sets (e.g., Earthbath Oatmeal & Aloe, Burt's Bees for Dogs)
Professional Grooming
- Frequency: Every 8–12 weeks for a sanitary trim and feathering neatening
- Cost range: $50–$85 per session depending on your area and the groomer's experience with Dachshunds
- Annual grooming budget: $250–$500
- Important: Tell the groomer you want a "breed-appropriate trim" — not a full clip-down, which can permanently alter coat texture in some dogs
Mat Prevention
Mats form when loose hairs tangle with growing hairs, creating dense knots close to the skin. In longhaired Dachshunds, mats most commonly develop:
- Behind and under the ears (where friction from ear movement compacts hair)
- In the "armpit" area (front leg junction)
- On the back of the rear thighs ("pants" area)
- Under the tail
Never try to cut mats out with scissors close to the skin — Dachshund skin is thin, and emergency vet visits for lacerations cost $200–$600. Use a dematting tool or take the dog to a professional groomer.
Health Considerations Specific to Longhaired Dachshunds
The FGF5 mutation itself doesn't cause disease — it's a cosmetic gene. However, longhaired Dachshunds share all breed-level health risks, and their coat type introduces a few specific concerns.
Breed-Wide Health Risks (All Coat Types)
According to the Merck Veterinary Manual, Dachshunds are predisposed to several conditions regardless of coat variety:
| Condition | Prevalence | Treatment Cost Range | Prevention |
|---|---|---|---|
| Intervertebral Disc Disease (IVDD) | ~25% of Dachshunds | $3,000–$8,000 (surgery) | Weight management, no jumping, ramp use |
| Patellar Luxation | Common in miniatures | $1,500–$3,500 (surgical) | Maintain lean body condition |
| Progressive Retinal Atrophy (PRA) | Higher in longhaired lines | No cure; management only | DNA testing of breeding stock |
| Lafora Disease (late-onset epilepsy) | Miniature wirehaired primarily, but tested across varieties | $200–$600/month (anti-seizure medication) | DNA screening before breeding |
| Obesity | Very common | Exacerbates IVDD risk | Measured feeding; ideal BCS 4–5/9 |
Coat-Specific Concerns for Longhaired Dachshunds
- Ear infections: The long, heavy ear feathering reduces air circulation in the ear canal, creating a warm, moist environment ideal for bacterial and yeast overgrowth. Prevention: Weekly ear cleaning with a veterinarian-approved ear cleanser ($8–$15 per bottle); keep ear feathering trimmed short if infections are recurrent.
- Hot spots (acute moist dermatitis): Mats trap moisture against the skin, leading to localized bacterial infections. More common in humid climates and during summer months.
- Tick detection difficulty: Longer coat makes it harder to spot ticks during daily checks. Use a monthly preventive (e.g., Bravecto, NexGard, or Simparica — $45–$75 per 3-month supply) and run fingers through the coat systematically after outdoor time.
- Skin allergies: Some longhaired lines show higher rates of atopic dermatitis, possibly linked to the spaniel ancestry. Consult your veterinarian if you notice persistent scratching, redness on the belly, or paw licking.
Myths vs. Facts About Long Haired Weiner Dogs
| Common Myth | What the Science Says | Verdict |
|---|---|---|
| "Longhaired Dachshunds shed less than smooth coats" | Longhaired Dachshunds are moderate shedders. The longer hair is more visible on furniture and clothing, but smooth coats shed shorter, stiffer hairs that embed into fabrics more stubbornly. Neither variety is hypoallergenic. | MYTH |
| "Longhaired Dachshunds have calmer temperaments" | Anecdotally, some owners and breeders report longhaired lines as slightly mellower, potentially reflecting spaniel ancestry influence. However, no peer-reviewed studies confirm temperament differences between coat varieties. Individual personality, socialization, and training are far stronger predictors. | PARTLY |
| "Longhaired Dachshunds are a separate breed" | All three coat varieties are one breed under the AKC, UKC, and FCI standards. They can be born in the same litter and are interbred. | MYTH |
| "You should shave a longhaired Dachshund in summer to keep them cool" | Dog hair provides insulation against both cold and heat, plus UV protection. Shaving can cause sunburn, disrupt the coat's natural temperature regulation, and in some cases lead to post-clipping alopecia (hair that doesn't grow back properly). A sanitary trim and neatening of feathering is sufficient. | MYTH |
| "Longhaired Dachshunds need more exercise" | Exercise needs are determined by the breed's energy level, not coat type. All Dachshunds need 30–60 minutes of daily activity regardless of coat variety. | MYTH |
Longhaired vs. Smooth vs. Wirehaired: A Comparison
| Trait | Smooth | Longhaired | Wirehaired |
|---|---|---|---|
| Coat Length | Short, dense (<1 inch) | 1–6 inches with feathering | Short, harsh, wiry with beard/brows |
| Primary Gene | FGF5 (wild-type/functional) | FGF5 (recessive mutation) | RSPO2 (furnishing gene) |
| Brushing Frequency | Weekly | 3–4x per week | 2–3x per week + hand-stripping |
| Annual Grooming Cost | $0–$150 | $250–$500 | $350–$700 |
| Cold Weather Tolerance | Low (needs a coat below 40°F/4°C) | Moderate | High (dense double coat) |
| Shedding Visibility | Moderate (short hairs embed in fabric) | Moderate-High (long hairs more visible) | Low-Moderate |
| Ancestry Influence | Original German hunting lines | Spaniel / Setter crosses | Terrier crosses |
When Coat Changes Signal a Health Problem
Not all coat changes in your longhaired Dachshund are normal. Watch for these red flags:
- Sudden coat thinning or bald patches: Can indicate hypothyroidism, Cushing's disease (hyperadrenocorticism), or alopecia X (also called "black skin disease," more common in Pomeranians but seen in Dachshunds). A veterinary workup including a thyroid panel and ACTH stimulation test ($150–$350) can diagnose hormonal causes.
- Dry, brittle, or dull coat: Often signals nutritional deficiency (particularly omega-3 and omega-6 fatty acid imbalance), hypothyroidism, or systemic illness. Adding a fish oil supplement (1,000 mg per 20 lb of body weight daily) may help, but rule out medical causes first.
- Excessive scratching with coat damage: Environmental allergies (atopic dermatitis), flea allergy dermatitis, or food allergies. The long coat can mask skin redness, so part the fur and inspect the skin weekly.
- Coat color changes: Gradual lightening or darkening can occur with age, but sudden changes warrant a vet visit to rule out endocrine disorders.
If you notice any of these changes, consult your veterinarian promptly. Early diagnosis of conditions like hypothyroidism can prevent progression and is often managed with inexpensive daily medication ($15–$30/month for levothyroxine).
Frequently Asked Questions
Why do some Dachshunds have long hair and others don't?
Coat length in Dachshunds is determined by the FGF5 gene. Longhaired Dachshunds inherited two copies of a recessive mutation that prevents the FGF5 protein from signaling the hair follicle to stop growing. Smooth-coated Dachshunds have at least one functional copy of the gene, which keeps the growth phase short. It's the same gene responsible for long coats in breeds like the Afghan Hound and Yorkshire Terrier.
Can longhaired Dachshunds have short-haired puppies?
Yes — if a longhaired Dachshund (L/L) is bred to a smooth-coated Dachshund that does not carry the longhair gene (S/S), all puppies will be smooth-coated but will carry one copy of the longhair allele (S/L). Those puppies could then produce longhaired offspring if bred to another carrier. This is why longhaired pups sometimes appear unexpectedly in smooth-coated litters.
How do I know if my Dachshund puppy will have a long coat?
Longhaired puppies are usually identifiable by 4–6 weeks of age — they develop noticeable ear feathering and longer fur on the legs compared to smooth littermates. Genetic testing via cheek swab (available through Embark, Wisdom Panel, or your veterinarian) can confirm coat genotype at any age.
Is the longhaired variety more prone to health problems?
The FGF5 longhair mutation itself does not cause disease. However, some breeders and researchers have noted that certain hereditary conditions — particularly progressive retinal atrophy (PRA) — appear at higher rates in specific longhaired breeding lines. This likely reflects historical founder effects (a limited gene pool when the variety was first established) rather than a direct link between coat genes and eye disease. Always ask breeders for OFA or PennHIP health clearances and PRA DNA test results.
What does it mean when my longhaired Dachshund's coat suddenly looks different?
Sudden coat changes — thinning, dullness, texture shifts, or color changes — can signal underlying health issues including thyroid dysfunction, Cushing's disease, nutritional deficiency, or skin infection. Hormonal conditions are particularly common in middle-aged to senior Dachshunds (ages 6–10). A veterinary exam with bloodwork is the appropriate first step before trying dietary supplements or grooming changes.
Is a longhaired Dachshund harder to care for than a smooth coat?
Moderately so. You'll spend approximately 40–60 minutes per week on brushing (compared to 10 minutes for a smooth coat) and $250–$500 annually on professional grooming. The longhaired variety also requires more attention to ear care and tick checks. However, many owners find the grooming routine to be a bonding experience, and the time investment is modest compared to high-maintenance breeds like Poodles or Afghan Hounds.
Veterinary Disclaimer: This article provides educational information about canine coat genetics and care. It does not replace professional veterinary advice. Always consult your veterinarian for diagnosis and treatment of health conditions, before starting supplements, or if you notice changes in your dog's coat, skin, or behavior.
Sources
- Cadieu, E. et al. (2009). "Genome-wide association study identifies a single major locus contributing to coat length variation in domestic dogs." Science, 325(5943), 995–998.
- American Kennel Club — Dachshund Breed Standard
- Merck Veterinary Manual — Dachshund
Beth Carrasco
All our authors care for dogs every day — read more of their work on the authors page.
