Why Puppies Stop Growing: Veterinary Insight & Growth Guide 2025 🩺🐾

By Dr. Duncan Houston BVSc

Hello, I’m Dr Duncan Houston BVSc, veterinarian and founder of Ask A Vet. One of the most concerning signs for new puppy owners is when a pup stops growing—or fails to thrive compared to littermates or breed expectations. In this detailed 2025 guide, I’ll walk you through all the possible causes—parasites, poor nutrition, growth plate injuries, hormonal and congenital disorders—and offer treatment, prevention, and care strategies 🐶🧬💙

1. Normal Puppy Growth Patterns 📈

Puppies grow rapidly in the first year, though timing varies by size:

• 🐾 Toy breeds: mature by 6–8 months
• 🐕 Small to medium breeds: 9–15 months
• 🐕🦺 Large and giant breeds: 12–24+ months

Growth is primarily driven by hormones (especially growth hormone and IGF-1) and controlled by growth plates—soft cartilage that eventually ossifies and closes 🦴

2. Why Puppies May Stop Growing Too Soon ⚠️

2.1 Parasites 🪱

Intestinal parasites like roundworms, hookworms, and Giardia rob the pup of nutrients, causing stunting, poor coat quality, diarrhea, and pot-bellied appearance. Routine deworming from 2 weeks old is essential 🧪

2.2 Poor Nutrition 🍽️

Puppies need a balanced, species- and size-appropriate diet with enough protein, calcium, and energy. Malnourishment or overfeeding of adult dog food can delay growth or cause skeletal deformities. Large-breed pups need special attention to avoid overgrowth 📉

2.3 Congenital Conditions 🧬

• Liver shunts: prevent nutrient processing; signs include stunting, drooling, seizures, or “head pressing”
• Pituitary dwarfism: rare in German Shepherds, leads to small size, puppy coat, delayed tooth eruption, and infertility

2.4 Early Spay/Neuter or Growth Plate Injury 🩺

Growth plate injuries (often from rough play or accidents) or early neutering (especially before 6 months in large breeds) may lead to abnormal limb length or premature growth arrest. X-rays can confirm closure too early 📸

2.5 Illness, Viruses, or Chronic Inflammation 🦠

Persistent diarrhea, immune deficiencies, parvovirus infection, and chronic stress or pain can interfere with GH and nutrient absorption 📉

3. How to Know Your Pup Isn’t Growing 📏

• 📆 No noticeable weight or height gain over 3–4 weeks
• 🐾 Lagging behind littermates or breed norms
• 🩺 Confirmed closed growth plates on X-ray too early
• 💩 Chronic soft stool, vomiting, lethargy, poor coat
• 🦴 Uneven limbs or limping from trauma

🧠 Early detection and diagnostics are key!

4. Veterinary Diagnosis 🔍

• 🧪 Fecal exam: parasites, Giardia, worms
• 🧬 Blood tests: for liver shunts, GH/IGF-1 levels, or endocrine issues
• 📸 X-rays: assess bone growth plates, trauma, or deformity
• 🧫 DNA testing: for breed-specific dwarfism or inherited metabolic issues

5. Treatment Options & Home Support 🛠️

5.1 Parasites

• 💊 Use monthly broad-spectrum dewormers (e.g., pyrantel, fenbendazole)
• 🧪 Repeat fecal testing after 2 weeks

5.2 Nutrition

• 🥣 Feed vet-approved puppy formula.
• 📏 Follow the weight-based feeding chart.
• 🥥 Add omega-3s and prebiotics for gut health.

5.3 Hormone Therapy or Surgery

• 🧬 GH injections or thyroid meds (for endocrine deficiencies)
• 🔬 Surgery for liver shunts or bone corrections

5.4 Physical Therapy & Rest

• 🦴 Avoid rough play with growing pups—especially large breeds
• 🏠 Use soft bedding, ramps, and joint supplements as needed

6. Prognosis & What to Expect 📊

• ✅ Parasite/nutrition-based issues: excellent recovery
• 🟡 Genetic or congenital disorders: variable outcomes
• 🔴 Growth plate injuries or untreated shunts: permanent deformity or stunting possible

📋 Follow-up every 4–6 weeks to track weight, length, and muscle development is advised 📈

7. Preventive Tips 🛡️

• 🧼 Deworm regularly—start at 2 weeks
• 🥗 Feed a complete puppy food—tailored by breed size
• 🏥 Delay neutering in large breeds until at least 12 months
• 🛏️ Protect growing pups from injury—no jumping off the furniture!

8. Ask A Vet,💡

• Ask A Vet: Teleconsults for growth concerns, injury triage, nutrition reviews

9. When to Call the Vet 🚨

• ❌ Puppy hasn't gained weight in 4+ weeks
• 😟 Diarrhea, poor coat, constant infections
• 🦴 Lameness or limb deformity noticed
• 🧬 Breeder or littermate has known growth issues

10. Final Thoughts 📝

Growth issues in puppies aren’t always obvious at first—but left unchecked, they can lead to lifelong health problems. With early veterinary intervention, balanced nutrition, and modern diagnostics, many causes are fully treatable. Through Ask A Vet guidance, you’ll have all the tools to help your pup grow healthy and strong in 2025 🐾💙 🌟