Long Haired Chihuahua Puppy Guide: Milestones, Feeding & Training

Bringing home a long haired Chihuahua puppy is a uniquely rewarding experience — and a uniquely challenging one. These tiny dogs, typically weighing just 2–6 lb (0.9–2.7 kg) as adults, require precision care that larger breeds simply don't demand. A missed meal can trigger hypoglycemia. A too-long crate session can backfire on potty training. An improperly timed vaccine can leave them vulnerable during their most fragile weeks.

This guide walks you through every critical stage of your long haired Chihuahua puppy's first year, with breed-specific data you won't find in generic puppy manuals. Whether you're picking up your pup at 8 weeks or planning ahead, you'll find exact feeding portions, vaccination timelines, socialization checklists, and realistic cost projections.

When Should You Bring Your Long Haired Chihuahua Puppy Home?

The American Kennel Club recommends that toy breed puppies, including Chihuahuas, remain with their littermates and dam until at least 10–12 weeks of age — not the 8-week standard often cited for larger breeds.

Why the extended timeline? Chihuahua puppies are exceptionally small at birth (typically 2.5–5.5 oz / 70–155 g) and develop more slowly than larger breeds in terms of immune system maturity, thermoregulation, and stress resilience. A long haired Chihuahua puppy separated at 8 weeks faces elevated risks of:

• Hypoglycemia episodes — their tiny livers store less glycogen, and the stress of relocation can trigger dangerous blood sugar drops
• Incomplete socialization — weeks 8–12 with littermates teach bite inhibition and canine communication signals that humans cannot replicate
• Heightened fear responses — premature separation correlates with increased noise sensitivity and separation anxiety in toy breeds

Reputable breeders of long haired Chihuahuas will typically keep puppies until 10–12 weeks, often administering the first two rounds of vaccines before release. If a breeder offers a 6- or 7-week-old Chihuahua puppy, consider this a significant red flag.

Long Haired Chihuahua Puppy Milestones: Week by Week

Understanding what's developmentally appropriate at each stage prevents both unrealistic expectations and missed intervention windows. Here's what to expect from your long haired Chihuahua puppy at each phase:

Feeding Your Long Haired Chihuahua Puppy: Schedule and Portions

Chihuahua puppies have the highest metabolic rate per pound of almost any breed. A 2-lb puppy burns calories roughly twice as fast as a 50-lb Labrador puppy of the same age. This makes precise, frequent feeding non-negotiable — hypoglycemia (low blood sugar) can become life-threatening within hours in a fasted Chihuahua puppy.

How Often Should I Feed My Puppy at Each Age?

Kibble selection matters. Choose a small-breed or toy-breed puppy formula with kibble pieces sized for tiny mouths. Look for an AAFCO statement confirming the food is complete and balanced for growth. Top-rated options for Chihuahua puppies include Royal Canin Chihuahua Puppy (breed-specific kibble shape), Hill's Science Diet Small Paws Puppy, and Purina Pro Plan Toy Breed Puppy.

Wet Food, Raw, or Supplements?

For puppies under 12 weeks, slightly moistening kibble with warm water (not milk) can aid chewing and digestion. Many Chihuahua owners mix in a teaspoon of canned puppy food to boost palatability. Avoid raw diets for puppies under 6 months — their immune systems are still developing, and the AVMA notes elevated pathogen risk with raw feeding, particularly in immunologically immature animals.

Vaccination Schedule for Long Haired Chihuahua Puppies

Chihuahua puppies follow the standard core vaccination protocol, but their small size means veterinarians sometimes adjust timing or split vaccine administration across visits to minimize adverse reactions. Here's the standard schedule based on AAHA/AVMA canine vaccination guidelines:

Vaccine reactions in Chihuahuas: Toy breeds have a statistically higher rate of vaccine reactions — roughly 1 in 250 Chihuahuas vs. 1 in 1,000 for mixed-breed dogs, according to a study published in the Journal of the American Veterinary Medical Association. Symptoms to watch for within 24 hours include facial swelling, hives, vomiting, collapse, or difficulty breathing. If any of these occur, contact your vet immediately or visit an emergency clinic.

When Can My Puppy Go Outside and Meet Other Dogs?

Your long haired Chihuahua puppy is not fully protected until approximately 7–10 days after the final DHPP dose at 14–16 weeks — meaning roughly 16–17 weeks of age. Before that point:

• Avoid dog parks, pet store floors, and any area where unknown dogs have been
• Safe socialization can occur in controlled environments: carry your puppy in a sling or carrier to experience outdoor sights and sounds; arrange playdates with known, fully vaccinated, gentle adult dogs in private yards
• Puppy kindergarten classes that require proof of at least 2 DHPP doses and maintain sanitized floors are generally considered acceptable by veterinary behaviorists after 10–12 weeks

The Critical Socialization Window: Weeks 3–14

Canine behavioral research consistently shows that the primary socialization period closes between 12–14 weeks. For a Chihuahua puppy — a breed already predisposed to wariness of strangers and novelty — missing this window can result in lifelong fear-based behaviors including aggression toward visitors, extreme barking, and inability to tolerate handling.

Socialization Exposure Checklist

Use this checklist between weeks 8–14 (your primary window after bringing puppy home). Every exposure should be paired with high-value treats (small bits of boiled chicken, freeze-dried liver) to create positive associations. Never force exposure — let the puppy approach at their own pace.

Potty Training Your Long Haired Chihuahua Puppy

When Will My Puppy Be Fully Potty Trained?

Realistically, expect 4–8 months for reliable house training in a long haired Chihuahua. This is longer than many larger breeds, and there are physiological reasons:

• Tiny bladder capacity — a 2-lb puppy can hold roughly 1–2 tablespoons of urine; they physically cannot "hold it" for extended periods
• High metabolism — faster digestion means more frequent elimination
• Cold sensitivity — Chihuahuas often refuse to go outside in rain, wind, or temperatures below 50°F (10°C), which stalls training progress in colder climates

Potty Training Timeline and Strategy

Indoor potty options: Many Chihuahua owners successfully train their dogs to use indoor potty solutions — pee pads, a real-grass patch (like Fresh Patch or DoggieLawn), or a litter box with dog-safe litter. This is not "giving up" on outdoor training; it's a practical accommodation for a 4-lb dog in an apartment or cold climate. You can train both: indoor pad for overnight/bad weather, outdoor for fair days.

Troubleshooting tips:

• If accidents increase suddenly at 4–6 months, rule out a urinary tract infection — Chihuahua puppies are susceptible; a vet urinalysis costs $45–$75
• If your puppy circles/sniffs but won't go outside in cold weather, try a fleece puppy sweater and a sheltered potty area
• Enzymatic cleaners (Nature's Miracle, Rocco & Roxie) are essential — standard household cleaners don't break down uric acid crystals, and residual scent triggers repeat elimination

Crate Training Progression

Crate training a long haired Chihuahua puppy requires respecting their physical limits. The general rule — one hour of crate time per month of age — still applies, but with an important caveat: never exceed these maximums during the day, and overnight bladder control develops faster than daytime control.

Crate selection tip: A MidWest iCrate or Frisco wire crate in the 24-inch size with a divider panel works well — start with the divider to create a snug space (just large enough for the puppy to stand, turn, and lie down), then expand as they grow. Too much space encourages pottying in one corner and sleeping in another.

Make the crate a positive space: feed meals inside with the door open, provide a snuggle toy (Snuggle Puppy with heartbeat simulator, ~$30, is excellent for the first weeks), and never use the crate as punishment.

Teething Timeline and Relief Strategies

Long haired Chihuahua puppies begin losing their 28 deciduous (baby) teeth around 14–16 weeks, with all 42 permanent teeth typically erupted by 6–7 months. Chihuahuas are notorious for retained deciduous teeth — where baby teeth fail to fall out as permanent teeth emerge — creating double-rowing that traps food and accelerates dental disease.

Teething Phase Breakdown

• 14–16 weeks: Incisors loosen first; you may find tiny teeth in bedding or food bowl (many puppies swallow them — this is harmless)
• 16–20 weeks: Canines (fangs) begin erupting; this is peak chewing intensity and discomfort
• 20–24 weeks: Premolars and molars erupt; chewing may intensify again
• 6–7 months: All permanent teeth should be in; schedule a dental check with your vet to confirm no retained baby teeth remain

Safe Chew Recommendations for Tiny Puppies

Standard puppy chew toys are often too large and too hard for a 2-lb Chihuahua. Opt for:

• Kong Classic Puppy (XS or Small) — fill with a smear of puppy-safe peanut butter (xylitol-free) and freeze for 15 minutes; the cold soothes gums
• Nylabone Puppy Chew Keys ( Petite) — designed for puppies under 15 lb; softer polymer than adult versions
• Frozen wet washcloth — twist a clean washcloth, soak in water or low-sodium chicken broth, freeze, and supervise chewing
• Whimzees Puppy Chewz (size XS) — edible, digestible dental chews appropriate for small breeds

Common Long Haired Chihuahua Puppy Problems and Solutions

How Do I Stop Puppy Biting and Nipping?

Chihuahua puppies bite — a lot. Their needle-sharp deciduous teeth, combined with a breed tendency toward mouthiness, make this the #1 complaint from new owners between 8–16 weeks.

What works (force-free methods only):

1. Redirect to a chew toy every time teeth touch skin — keep a Nylabone or Kong within arm's reach at all times
2. "Ouch" + freeze — when bitten, say "ouch" in a calm, medium tone, then freeze and withdraw attention for 10–15 seconds. This mimics littermate behavior
3. Time-outs — if biting persists after 2–3 redirects, calmly place puppy in a playpen (not the crate — keep crate positive) for 30–60 seconds to reset
4. Reward gentle play — when puppy licks or plays without teeth, immediately reward with a treat and praise

Expect biting to decrease significantly once adult teeth are fully in (~6–7 months). If mouthing persists or escalates to hard biting past 8 months, consult a certified professional dog trainer (CPDT-KA) or veterinary behaviorist.

Nighttime Whining and Crying

First-week whining is normal and expected — your puppy has been separated from their littermates for the first time. Strategies that work:

• Snuggle Puppy with heartbeat — simulates the feeling of sleeping against littermates; highly effective for the first 1–2 weeks
• Place crate beside your bed — your scent and breathing sounds provide comfort; you can gradually move the crate to a permanent location over 2–3 weeks
• Cover the crate with a breathable blanket to create a den-like feel
• Do not respond to whining by letting puppy out (unless it's a potty signal — take them out on a leash, no play, then back in) — this teaches that whining = freedom

Chewing on Furniture and Cords

Chihuahua puppies are surprisingly capable chewers despite their size. Puppy-proof at their level:

• Use bitter apple spray (Grannick's Bitter Apple, ~$8) on furniture legs and baseboards
• Cover electrical cords with split loom tubing or cord concealers
• Provide 5–7 approved chew toys rotated every 2–3 days to maintain novelty
• Supervise or confine — a puppy playpen (e.g., IRIS USA 4-panel pen, ~$40) is essential for unsupervised moments

First-Year Cost Breakdown for a Long Haired Chihuahua Puppy

Budgeting accurately prevents unpleasant surprises. Here's a realistic cost breakdown for the first 12 months, based on 2025–2026 US pricing:

Frequently Asked Questions

Raising a long haired Chihuahua puppy rewards patience with one of the most devoted companions in the canine world. Their small size demands precise care, but the data in this guide gives you a clear roadmap through every developmental stage. When in doubt about your puppy's health or behavior, your veterinarian is always your best resource — no online guide replaces a hands-on exam.