Long-Haired Chihuahua: the silky-coated version of the world's smallest breed

When two puppies from the same litter play on the floor and one has long fringes on its ears while the other keeps its coat pressed flat to the body, the inevitable question is whether they are even the same breed. The official answer from both the American Kennel Club and the Fédération Cynologique Internationale has been the same for decades: same breed, same standard, with coat length the only thing that varies. The long-haired variety and the smooth-coat variety can appear in the same litter because the gene that controls coat length is recessive: two smooth-coat parents that both carry the allele can produce long-coat puppies. What does change with the long-coat variety, in the day-to-day reality of living with the dog, comes down to three concrete things: grooming, cold tolerance, and presentation in the show ring. Everything else, temperament, health, longevity, and inherited problems, is identical to the smooth-coat variety. This article focuses on what sets the silky version apart.

What is the real difference between the long-haired and smooth Chihuahua?

The single official difference is coat length. The breed standard describes the long coat as "fine and silky, flat or slightly wavy." The areas with visible fringe are the ears, the neck (which forms a small ruff or mane), the backs of the legs, the feet, and above all the tail, which on an adult carries as a broad plume arched over the back. The undercoat is sparse but noticeable, unlike the smooth variety, which has almost none.

That anatomical difference has three practical consequences an owner discovers in the first few weeks.

Grooming. Brush two to three times a week with a soft-bristle brush and a fine-toothed comb to lift dead hair and prevent mats behind the ears and in the armpits. Bathe every three or four weeks with a gentle dog-pH shampoo. Drying the dog completely matters, because long hair holds moisture and can encourage dermatitis in the neck fold on dogs with a thick ruff. The frequency is moderate, and the time per session is short given the size of the animal.

Cold tolerance. Better than the smooth coat but still limited. Body mass is the same, 3 to 6.5 lb (1.5 to 3 kg), and the undercoat offers partial protection but nothing close to a northern breed. In winter below 41°F (5°C) a coat is still recommended, especially on long walks in cold regions, mountain areas, or continental climates. What the long coat does allow is skipping the sweater indoors in a reasonably heated home.

Show presentation. This is where the difference becomes visible. The long variety scores in the ring on the quantity and quality of its fringe: heavily feathered ears, a plumed tail, a well-defined ruff. Breeders who specialize in show lines select dogs with a particularly dramatic coat, which in some cases produces lines that tend toward a thicker coat than you might otherwise expect.

Why does the long coat appear in litters from smooth-coat parents?

Because coat length in the Chihuahua follows a classic Mendelian pattern: the smooth-coat allele (L) is dominant over the long-coat allele (l). A smooth-coat dog can be genetically LL (homozygous dominant) or Ll (heterozygous carrier). Two Ll dogs bred together produce roughly one quarter LL pure smooth coat, one half Ll smooth-coat carriers, and one quarter ll long coat. The arithmetic explains why a breeder can hand over two siblings that look different without their being separate breeds at all.

A DNA test for the FGF5 locus (the gene responsible for coat length in many dog breeds) lets a breeder identify carriers before mating. A serious breeder selecting for a specific coat variety uses the test to plan litters with a predictable outcome.

What is the temperament like?

Identical to the smooth-coat Chihuahua: alert, bold for its size, intensely bonded to one person, lively, territorial. The popular idea that the long coat is calmer has no support in behavioral research. Studies on breed temperament find no meaningful differences between coat varieties within the same standardized breed.

What does vary is owner perception. A long-coated dog with feathered ears and a soft ruff looks visually more cuddly and tends to get handled and carried more by its owners. That added handling can translate into stronger bonding or, in extreme cases, into overprotection and defensive reactivity around visitors. The pattern is well documented in canine behavior consults for toy breeds in general.

With strangers it is reserved at first and defensive if the situation triggers it. With other small dogs and with cats it can live well if socialized from puppyhood; with large dogs the risk of accidental injury from being stepped on or from a redirected bite is a real danger, and cohabitation demands strict supervision.

What health problems does the breed have?

The six documented problems are the same as in the smooth-coat variety, and they are worth summarizing briefly because any buyer should know them before signing anything.

Patellar luxation. Roughly 5 percent of dogs evaluated by the Orthopedic Foundation for Animals show grade II or higher luxation. Intermittent limping when jumping, especially coming down off the couch or out of the car. Corrective surgery in grades III and IV.

Neonatal and juvenile hypoglycemia. Puppies are born at 2.8 to 4.2 ounces (80 to 120 grams). Feed four or five small meals a day for the first three months, and keep honey or glucose syrup on hand for emergencies.

Hydrocephalus linked to an open molera. The open cranial fontanelle (the molera) affects 80 to 90 percent of dogs to varying degrees. Most never develop hydrocephalus; 1 to 3 percent do, with progressive neurological signs. The breeder should document skull palpation, with an ultrasound if there is any doubt.

Degenerative mitral valve disease. Appears from around seven or eight years of age in 30 to 40 percent of dogs. Annual echocardiography from age six. Pimobendan once significant regurgitation is documented, per the ACVIM 2019 consensus.

Tracheal collapse. Chronic dry honking cough, worsened by a collar. Use a padded H-style harness from puppyhood.

Early-onset periodontal disease. The toy dog's jaw does not have room to seat every tooth correctly. Brush three times a week with enzymatic paste and schedule annual dental cleaning under sedation from age three.

On top of the six common problems, the long-haired variety adds one of its own: external ear infections from hair in the ear canal. The fringe inside the ears can shed and collect down in the canal, trap moisture, and encourage recurrent infections. Check the ear weekly, and have a knowledgeable groomer or vet tech carefully pluck the inner hair every two or three months if the dog is prone to ear trouble.

Documented life expectancy from the VetCompass program at the Royal Veterinary College runs around 14 years at the median, with verified cases of 18 and exceptional ones of 20.

How much exercise does it need, and is it good for a small apartment?

Twenty to thirty minutes of walking a day, split into two short outings. Adaptation to apartment life is perfect. Mental stimulation is essential: search-and-find toys, basic obedience work, short sessions with the owner. Boredom in this breed always turns into reactive barking or chewed baseboards.

The delicate point is summer heat. The long coat increases thermal insulation in hot weather. In warm regions or anywhere with summer temperatures above 86°F (30°C), the long-coated dog often seeks out cool corners of the home, tile or stone floors. An elevated, ventilated bed, water always available, and walks at cooler hours (early morning, late evening) are basic health measures. Shaving the coat in summer is not recommended by the standard, and serious breeders advise against trimming beyond the fringe.

How much does it cost, and how do you choose a good breeder?

The price in the US in 2026 runs from $1,200 to $3,000 from a reputable, health-testing breeder. The long-haired variety usually carries a slightly higher price than the smooth coat (roughly $150 to $400 more) because of the heavier aesthetic selection in show lines. Below $800, be suspicious of casual breeding with no health testing.

The five basic questions are the same as for the smooth-coat variety, plus one specific to this coat:

Weight and conformation of the parents (no "super minis" or teacup claims).
Cardiac and ophthalmologic clearances on both parents.
Official patella evaluation (OFA or PennHIP).
Closure or size of the molera at the time the puppy goes home.
Feeding plan for the first three months.
FGF5 genetic typing if the breeder selects for coat length.

Estimated annual spend for a healthy adult in the US:

Premium toy-formula food: $300-500.
Routine veterinary care: $300-600.
Optional grooming (fringe trim and bath): $150-350.
Care products (H harness, sweater, elevated bed): $80-200.
Pet insurance: $200-450.

Total: roughly $1,030 to $2,100 a year with no unexpected conditions.

Long-haired Chihuahua at a glance

Block	Item	Value
Identification	Canonical name	Chihuahua (long-coat variety)
	Other names	Long Coat Chihuahua, Longhaired Chihuahua
	Origin	Mexico
	FCI standard	No. 218 (shared with the smooth-coat variety)
	FCI group	9 (Companion dogs)
	FCI section	6 (Chihuahueno)
	AKC group	Toy Group
Physical	Ideal weight	3-6.5 lb (1.5-3 kg)
	Height at withers	6-9 in (15-23 cm)
	Coat	Long, fine, silky, flat or slightly wavy
	Undercoat	Sparse but present
	Fringed areas	Ears, neck, backs of legs, tail
	Accepted colors	All colors and combinations, except merle
Health	Life expectancy	12-15 years (VetCompass median around 14)
	Maximum documented age	18-20 years
	Common conditions	The six standard Chihuahua issues plus ear-canal infections
	Recommended pre-breeding tests	Cardiology, OFA patella, ophthalmology, FGF5 DNA
Temperament	Energy	Medium
	Trainability	Medium
	Barking	High, constant alertness
	Reactivity toward strangers	High
	Living with large dogs	Cautious, risk from reactivity and from being stepped on
	Tolerance of being alone	Low to medium
Lifestyle	Daily exercise	20-30 minutes, two short walks
	Apartment-suitable	Yes, ideal
	Heat tolerance	Medium to low (worse than smooth coat in severe heat)
	Cold tolerance	Low to medium (better than smooth coat)
	Coat care	Brush 2-3 times a week, bathe every 3-4 weeks
US market	Puppy price from a reputable breeder	$1,200-3,000
	Price difference vs smooth coat	+$150 to +$400
	Estimated annual spend	$1,030-2,100 with no unexpected conditions

Is the long-haired Chihuahua for you?

It fits if you are drawn to the silky look, can spare ten to fifteen minutes a week for brushing, live in an apartment or climate-controlled house, and accept the same limitations as the smooth-coat variety (physical fragility, long lifespan, intense bonding). It does not fit if your fantasy is a zero-maintenance "purse" Chihuahua, or if the idea of checking ears and cleaning tear stains every week feels like a chore.

FAQ

How long does a long-haired Chihuahua live? The same as the smooth-coat variety: a median of 14 years, with verified cases of 18. Longevity is set by the genetic line and the care, not by coat length.

Is the long coat calmer than the smooth coat? There is no behavioral evidence for it. Experienced breeders and owners agree that temperament depends on the specific line and on socialization, not on coat length. The perception of greater calm is usually an optical effect of the silky coat.

Can you shave it in summer? Not advisable. The standard does not allow trimming the coat, and serious breeders consider that the long coat regulates body temperature better than bare skin under direct sun. The fringe can be tidied to even out the silhouette without affecting the standard.

Is it a good breed for older people? Excellent, just like the smooth-coat variety. The one added requirement is time for regular brushing: if fine motor control is a problem, grooming can be handed off to a professional at moderate cost.

Does it need clothing in winter? Less than the smooth-coat variety, but yes in cold continental climates. Below 41°F (5°C) on long walks, use a fleece coat. Indoors in a reasonably heated home, it does fine without clothing.