At a glance
- Rat Terriers typically live 15-18 years but are prone to hip dysplasia, eye problems, and heart conditions
- Regular veterinary check-ups and genetic testing can catch serious conditions like Primary Lens Luxation early
- Weight management through portion control and regular exercise prevents many health complications
- Heart failure is the leading cause of death in the breed, making cardiac monitoring essential as dogs age
What you might notice first
Many Rat Terrier owners first become concerned when they notice their dog limping after play or struggling to jump onto furniture they once managed easily. These subtle changes often signal the early stages of joint problems that affect many dogs in this breed.
Hip dysplasia and patellar luxation are among the most common issues you'll encounter. With hip dysplasia, your dog might show stiffness in their back legs, particularly after rest periods or exercise. The condition causes pain that ranges from mild discomfort to significant mobility issues. Patellar luxation presents differently, you'll typically see intermittent limping or your dog holding one back leg up briefly while walking.
Research shows that maintaining a healthy weight significantly reduces the severity of these joint conditions. Even a small weight gain can put additional stress on already compromised joints, making early intervention crucial.
Eye problems that require immediate attention

When it comes to eye health in Rat Terriers, two conditions stand out as particularly concerning. Primary Lens Luxation and Progressive Retinal Atrophy can both lead to vision loss if not caught early.
Primary Lens Luxation often appears suddenly. You might notice your dog's eye looking cloudy or producing excessive tears. This condition requires immediate veterinary attention, as surgery may be necessary to prevent permanent damage. The good news is that genetic testing can identify dogs at risk before symptoms appear.
Progressive Retinal Atrophy develops more gradually. Many owners first notice their dog bumping into objects in dim lighting or showing reluctance to navigate stairs at night. Unfortunately, there's no cure for PRA, but early detection helps you adapt your home environment and maintain your dog's quality of life.
Regular eye examinations, ideally annually, give you the best chance of catching these conditions early. Many Rat Terriers show no obvious symptoms until the disease has progressed significantly.
Heart health becomes critical with age
Heart failure represents the leading cause of death in this breed, typically appearing in senior dogs. The symptoms often develop slowly, making them easy to miss initially. You might notice your dog coughing more frequently, especially at night, or becoming winded during normal activities they previously handled easily.
Difficulty breathing and increased fatigue during exercise are other warning signs that warrant immediate veterinary attention. Some dogs also develop a persistent cough that worsens when lying down.
Prevention focuses on maintaining cardiovascular health throughout your dog's life. Regular exercise appropriate for their age and size, combined with a balanced diet, supports heart function. Annual cardiac check-ups become particularly important after age seven, when most heart conditions begin to develop.
Managing allergies and skin problems
Excessive scratching, red inflamed skin, and recurring ear infections often signal allergies in these dogs. The constant scratching can create secondary skin infections that complicate treatment and cause significant discomfort.
Many Rat Terriers benefit from fish-based protein diets, which can help reduce skin inflammation associated with food allergies. However, environmental allergens like pollen, dust mites, or certain cleaning products can also trigger reactions.
Working with your veterinarian to identify specific allergens through elimination diets or allergy testing provides the most effective long-term solution. Antihistamines offer temporary relief, but addressing the underlying cause prevents recurring problems.
Regular flea and tick prevention using topical medications or specialised collars also reduces skin irritation from parasite bites, which can trigger allergic reactions in sensitive dogs.
Preventing obesity before it starts
Weight gain happens gradually in most dogs, making it easy to overlook until it becomes a significant problem. Obesity compounds nearly every other health issue these dogs face, from joint problems to heart disease.
Using AAFCO-approved dog food formulated for small breeds provides the right nutritional balance. Portion control becomes easier with tools like kibble dispensers that measure consistent serving sizes. Many owners find success feeding smaller, more frequent meals rather than one or two large portions daily.
Regular exercise tailored to your dog's age and physical condition helps maintain healthy weight. Young, active dogs need vigorous play and longer walks, while senior dogs benefit from gentler, more frequent activity sessions.
Supporting joint health throughout life

Legg-Calvé-Perthes Disease affects the hip joint in young dogs, typically appearing between four and twelve months of age. Unlike other joint conditions, this disease often requires surgical intervention for the best outcome.
Adding joint supplements containing chondroitin and glucosamine to your dog's diet may help support cartilage health, particularly in dogs showing early signs of joint problems. These supplements work best as preventive measures rather than treatments for advanced conditions.
Regular, moderate exercise helps maintain muscle strength around joints, providing natural support and stability. Swimming, when available, offers excellent low-impact exercise that builds muscle without stressing joints.
Creating a prevention-focused health plan
The most effective approach combines regular veterinary care with proactive home management. Schedule check-ups every six months for dogs over seven years old, and annually for younger, healthy dogs.
Genetic testing for conditions like Primary Lens Luxation helps identify risks before symptoms appear. This information allows you to monitor more closely and intervene earlier when problems develop.
Keep detailed records of any changes in behaviour, appetite, or activity level. These subtle shifts often provide the first clues about developing health issues. Your observations, combined with regular professional monitoring, give your dog the best chance of enjoying their full 15 to 18-year lifespan in good health.