Common Health Problems in Chihuahuas
The Chihuahua is a sturdy dog for its size, but its tiny body and genetic selection bring along a series of health problems that show up frequently in the breed. Knowing them isn’t meant to scare you, but to help you spot warning signs early and act before a small issue turns into a serious one. Here’s a realistic overview of common Chihuahua health issues, why they happen, and what you can do as an owner.
Dental problems, the number one weak spot
If there’s one Chihuahua health problem that’s almost guaranteed to appear, it’s dental issues. Their small jaw forces the teeth to crowd together, which encourages tartar buildup, gum inflammation, and early tooth loss.
- Persistent bad breath even when the dog seems healthy
- Red or bleeding gums when touching the mouth
- Difficulty chewing hard kibble
- Visible tartar in the form of yellowish or brown plaque
Regular brushing and periodic vet checkups are the best prevention. If you notice any of these signs, a vet visit shouldn’t wait.
Patellar luxation, a typical injury in small breeds
The kneecap slips out of place more easily in small dogs, and the Chihuahua is no exception. It can be a one-off event that the dog resolves on its own by shaking the leg, or it can become a recurring problem that needs intervention.
Watch for intermittent limping, especially after jumping off the couch or running. That repeated skip-hop on the hind leg is one of the clearest signs of this condition.
Tracheal collapse
Tracheal collapse happens when the rings that support the trachea weaken and it loses its cylindrical shape. It’s especially common in small dogs with short, compact necks like the Chihuahua.
- Dry cough that sounds like a "goose honk"
- Worsens with excitement, heat, or pulling on the leash
- May come with breathing difficulty in more advanced episodes
Using a harness instead of a collar greatly reduces pressure on the area and helps prevent the problem from worsening.
Hypoglycemia, a bigger risk in puppies
Due to their tiny size, Chihuahuas have little stored energy reserve. Puppies and very small adults are especially vulnerable to drops in blood sugar, particularly if they go many hours without eating or get a lot of exercise.
Sudden weakness, trembling, or disorientation are warning signs that require immediate veterinary attention. If you have a puppy, check out our guide to caring for a Chihuahua puppy in its first months to better understand its feeding needs during this delicate stage.
Heart problems
Among the most common hereditary conditions in the breed are certain heart valve issues, which tend to appear with age. They don’t always show visible symptoms at first, which is why annual vet checkups are so important from adulthood onward.
Coughing after lying down, unusual fatigue, or difficulty breathing after minimal exertion are signs a vet should evaluate as soon as possible.
Hydrocephalus and the open fontanelle
Many Chihuahuas are born with a soft spot on the skull, similar to a human baby’s fontanelle, which in some cases never fully closes. When fluid builds up in the brain, hydrocephalus occurs, a condition that can cause a disproportionately large head, abnormal behavior, or seizures.
Not every Chihuahua with an open fontanelle develops this problem, but it’s something a vet should monitor from the puppy’s first checkups.
Eye problems
The breed’s characteristic large, protruding eyes are also more vulnerable to bumps, scratches, and dryness. Cataracts, progressive retinal atrophy, and corneal ulcers show up fairly often in this breed.
- Excessive tearing or yellowish discharge
- Squinting or cloudy-looking eye
- Rubbing the face against the floor or furniture
Sensitivity to cold and temperature regulation issues
Their small body and thin coat give them little ability to retain heat, making them prone to shivering, catching a chill, or even suffering hypothermia in cold environments. At the other extreme, excessive heat doesn’t suit them well either, so temperature management is a constant concern in their care. You can dig deeper into this topic in our article on how to care for a Chihuahua in summer and warm climates.
Obesity and its multiplying effect on other problems
Excess weight in such a small dog has an enormous impact: it worsens kneecap problems, strains the heart, and speeds up joint wear. A few extra grams are proportionally equivalent to several extra kilos on a large dog.
Controlling portions and avoiding unnecessary treats is one of the most effective ways to prevent a good portion of the Chihuahua health problems we’ve mentioned so far.
How to reduce the risk of these conditions
None of these conditions can be prevented one hundred percent, but consistent habits make a real difference in your dog’s quality of life.
- Vet checkups at least once a year, twice if your dog is a senior
- Regular tooth brushing starting as a puppy
- Strict control of weight and food portions
- Using a harness instead of a collar
- Avoiding jumps from heights like couches or beds
These care habits are part of a broader routine you can check out in our complete Chihuahua care guide, where we cover everything essential to keeping them healthy at every stage of life.
Frequently Asked Questions
What diseases do Chihuahuas get most often?
The most common are dental problems from overcrowded teeth, patellar luxation, tracheal collapse, and certain heart conditions that tend to appear with age. Eye problems are also common due to their large, protruding eye shape.
Is hypoglycemia dangerous in adult Chihuahuas?
It’s more common and dangerous in puppies, but very small adults can also suffer from it if they go many hours without eating or do intense exercise. Keeping regular feeding schedules greatly reduces the risk.
How do I know if my Chihuahua has a kneecap problem?
The most common sign is intermittent limping, where the dog walks normally and suddenly lifts a hind leg for a few steps. If you notice this, it’s time to consult a vet to assess how serious the problem is.
Does using a collar make trachea problems worse?
Yes, constant pressure from a collar on the neck can worsen tracheal collapse in predisposed dogs. Switching to a well-fitted harness is one of the simplest and most effective ways to protect this area.
Do all Chihuahuas develop these diseases?
No, many dogs live healthy lives without developing any of these serious problems. These are breed predispositions, not guarantees, and good care habits considerably reduce the odds.