Internal Medicine for Pets Accurate answers. Thoughtful treatment. Better outcomes. Care You Can Trust From a team you can love.

At Fullerton Pet Clinic, we specialize in diagnosing and treating internal medicine conditions in both dogs and cats—from playful puppies and curious kittens to aging seniors. Our goal is to provide proactive, personalized care that supports your pet’s health at every age. Comprehensive care through every life stage

For Puppies & Kittens

Young pets may seem resilient, but their immature immune systems make them more vulnerable to illness. Common early-life issues include:

  • Vomiting or diarrhea (which can lead to dehydration or low blood sugar)
  • Serious infectious diseases like parvovirus

Even minor symptoms can escalate quickly in puppies and kittens. Early diagnosis and treatment are critical. If your young pet is showing signs of illness or discomfort, don’t wait—our experienced veterinary team is here to help.

For Adult Pets

As pets grow, their risk of internal medical issues shifts. Adult dogs and cats can develop:

  • Respiratory infections
  • Digestive disorders
  • Illnesses from outdoor exposure, like tick-borne diseases
  • Contagious diseases from social settings (e.g., kennel cough)

Even if symptoms seem mild, assuming your pet will “get better on their own” can lead to more serious problems. Timely intervention helps prevent acute issues from becoming chronic or irreversible.

For Senior Pets

Older pets face a higher risk of developing internal conditions, including:

  • Diabetes mellitus
  • Cushing’s disease (hyperadrenocorticism)
  • Thyroid disorders (hypothyroidism in dogs, hyperthyroidism in cats)

Keep an eye out for signs like changes in appetite, weight, thirst, urination, or energy level. These are not just signs of aging—they could signal something more serious.

We recommend bi-annual wellness exams for all senior pets. These check-ups help us catch changes early, using thorough exams and diagnostic testing to identify issues before they progress.

At Fullerton Pet Clinic, your pet’s comfort and long-term health are our top priorities. Whether we’re treating a mild illness or managing a complex internal disease, we use advanced diagnostic tools and compassionate care to guide every treatment plan. With our experienced team and in-house resources, you can feel confident knowing your pet is in the best hands.

If your pet isn’t acting like themselves—or if you just want peace of mind—don’t wait. The earlier we detect a problem, the more we can do to help. Book a consultation today and let’s give your pet the care they need to live a healthy, happy life. Why Early Diagnosis Matters