Chihuahua Health Issues: Common Problems
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Chihuahuas are long-lived little dogs, often reaching their mid-to-late teens, but their tiny size brings specific risks. The most common Chihuahua health issues are dental disease, luxating patella (slipping kneecaps), heart problems, a collapsing trachea, and low blood sugar in puppies. Most are very manageable when caught early, so knowing the signs and keeping up with vet checks makes a real difference to a long, comfortable life.
Dental disease
Dental disease is arguably the single most common health problem in Chihuahuas. Their small jaws crowd the teeth, trapping plaque and tartar, and many Chihuahuas also retain baby teeth that need removal. Left unchecked, this leads to painful gums, tooth loss, and bacteria that can affect the heart and other organs.
- Watch for bad breath, red or bleeding gums, reluctance to eat hard food, pawing at the mouth, or loose teeth.
- Help at home with regular tooth brushing and vet-approved dental products, plus professional cleanings as your vet advises.
See our guide to bad breath in dogs for what early dental trouble looks and smells like.
Luxating patella (slipping kneecap)
A luxating patella is a kneecap that slips out of its groove, very common in toy breeds like the Chihuahua. It's often present from birth and ranges from mild to severe.
- Classic sign: an intermittent "skip" or hop in the back leg, sometimes with the leg held up for a step or two before returning to normal.
- Grades 1–4 describe severity. Mild cases may just be monitored; more severe ones can cause lameness, arthritis over time, and may need surgery.
Keeping your Chihuahua at a lean weight takes strain off the joints. If you notice any skipping gait, mention it at the next visit — see also luxating patella in dogs.
Heart disease and collapsing trachea
Two conditions affect the chest as Chihuahuas age:
- Heart disease — especially degenerative mitral valve disease, common in small breeds. It's often first detected as a heart murmur during a routine exam, sometimes years before symptoms like coughing, tiring easily, or faster breathing appear.
- Collapsing trachea — the windpipe's cartilage rings weaken and flatten, producing a distinctive dry, honking cough, often triggered by excitement, pulling on a collar, or exercise.
Practical take: Use a harness rather than a neck collar. It reduces pressure on the windpipe and is gentler on a small, delicate neck — a small change that genuinely helps dogs prone to tracheal collapse.
Low blood sugar and other size-related risks
Because Chihuahuas are so small, a few problems relate directly to their size:
| Condition | What to know |
|---|---|
| Hypoglycemia (low blood sugar) | Common in puppies and tiny adults; signs include weakness, wobbliness, trembling, glazed eyes, and even seizures. Small frequent meals help prevent it. |
| Molera (soft spot) | Many Chihuahuas are born with an open soft spot on the skull. It's usually harmless but means the head needs gentle handling and protection. |
| Hydrocephalus | Fluid on the brain, seen more in dogs with a very domed head; signs include a dome-shaped skull, disorientation, and developmental delays. |
| Injury & cold sensitivity | Fragile bones mean falls and jumps can fracture legs; low body mass means they chill easily and often need a sweater in cold weather. |
A hypoglycemic episode can be an emergency. If a Chihuahua puppy becomes weak, wobbly, or collapses, rubbing a little corn syrup or honey on the gums can help while you call your vet immediately.
Eye problems and keeping a Chihuahua healthy
Chihuahuas' large, prominent eyes are prone to dryness, corneal injury, and conditions like progressive retinal atrophy. Watch for redness, cloudiness, squinting, or discharge — see dog eye discharge for when to worry.
Across all these issues, the same habits protect this long-lived breed:
- Keep them lean — even a little extra weight strains joints, heart, and windpipe. Check with our is my dog overweight guide.
- Prioritize dental care from a young age.
- Feed small, regular meals, especially for puppies.
- Use a harness and protect them from falls, jumps, and cold.
- Keep up with annual (or twice-yearly for seniors) vet exams so murmurs, kneecaps, and dental issues are caught early.
Because so many Chihuahua problems progress slowly, tracking weight, coughing episodes, appetite, and dental notes over time helps you and your vet spot a trend before it becomes a crisis.
Track your Chihuahua's health over the years
Tavi keeps your Chihuahua's weight, dental notes, coughing episodes, medications, and vet-visit results in one place and charts them over time — so slow-building issues like heart or joint problems surface early. Free for your first pet.
Frequently asked questions
What health problems are Chihuahuas most prone to?
The most common are dental disease, luxating patella (slipping kneecaps), heart disease such as mitral valve disease, collapsing trachea, and low blood sugar in puppies. They can also have eye problems, an open soft spot (molera), and fragile bones prone to fracture from falls.
How long do Chihuahuas live?
Chihuahuas are among the longest-lived dog breeds, often reaching their mid-to-late teens with good care. Keeping them at a healthy weight, staying on top of dental care, and catching heart and joint issues early all support a long, comfortable life.
Why does my Chihuahua cough like a honk?
A dry, honking cough — especially with excitement, exercise, or collar pressure — is the classic sign of a collapsing trachea, which is common in the breed. Switch to a harness and have your vet check it, as it can range from mild to significant.
Why do Chihuahua puppies get low blood sugar?
Their tiny size means very small energy reserves, so skipping meals, stress, or illness can drop their blood sugar quickly. Signs include weakness, trembling, wobbliness, and even seizures. Feed small, frequent meals, and if an episode happens, rub a little corn syrup on the gums and call your vet immediately.
Should I use a collar or harness on my Chihuahua?
A harness is generally better. It removes pressure from the delicate neck and windpipe, which matters a lot for a breed prone to collapsing trachea, and it's safer for such a small dog overall.
Tavi's guides are informational and not a substitute for professional veterinary advice, diagnosis or treatment. When in doubt, call your veterinarian. Sources: American Kennel Club (AKC); Chihuahua Club of America; VCA Animal Hospitals; Merck Veterinary Manual; Orthopedic Foundation for Animals (OFA)