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Large Dogs and Silent Illnesses: What a Check-Up Can Reveal

If you live with a large dog, you know how strong and resilient they usually are — and sometimes even a little “tough.”

Thor, my German Shepherd, is exactly like that: full of energy, always alert, and fiercely protective.

But it was that very toughness that made me miss the early signs that something was wrong.

The truth is, many health issues in large dogs are silent and only show up during routine check-ups.

If I hadn’t taken Thor in for a preventive visit, we might have missed something that could’ve become serious later.

The Quiet Threat: Diseases Without Early Symptoms

Large breeds are prone to several conditions that don’t show obvious signs in the beginning.

Common silent issues include:

  • Hip dysplasia: a degenerative joint condition. Early signs are subtle — the dog may simply avoid running or jumping.
  • Heart disease: like dilated cardiomyopathy. Often symptomless until it’s advanced.
  • Hormonal imbalances: such as hypothyroidism, which may cause weight gain, fatigue, and coat issues.
  • Kidney or liver dysfunction: rarely noticeable in early stages.
  • Internal tumors: that grow without showing external signs.

With Thor, we caught the early stages of hip dysplasia during an X-ray taken at a routine check-up.

He wasn’t in pain yet, but there was visible wear on the joints.

Thanks to that, we started preventive care with supplements, weight management, and adjusted exercise routines.

Why Regular Check-Ups Are a Must

Scheduling a vet check-up at least once a year — or every six months for older dogs — can make all the difference.

Common evaluations include:

  • Full blood count
  • Urinalysis and fecal exams
  • Cardiac screening
  • Abdominal ultrasound
  • Orthopedic exams (for at-risk breeds)
  • Hormone panels when needed

Plus, the clinical exam often picks up changes in behavior, coat, eyes, or gums that go unnoticed at home.

What Thor Taught Me

The biggest lesson: don’t wait for your dog to look sick before seeing the vet.

Large dogs like Thor often tolerate discomfort for longer and hide signs of pain.

Since that discovery, his annual check-up is a fixed event on our calendar.

It’s an investment I make gladly, knowing it’s the best way to keep him healthy, strong, and happy.