What are the symptoms of a dog having hookworms?

Noticing small changes in your dog’s behavior or health can be a sign something’s off—especially when it comes to hookworms, a common parasite that can sneak up on even the most careful pet owners. These tiny worms live in your dog’s intestines, feeding on their blood, and early symptoms are easy to miss if you don’t know what to look for. Catching signs early not only eases your dog’s discomfort but also keeps the issue from getting worse.

One of the first red flags is changes in your dog’s stool. You might see diarrhea that’s soft, watery, or even tinged with blood—sometimes dark and tarry, which means the blood has been digested. Constipation can happen too, though it’s less common. Your dog might also strain more when they go, or you could notice they’re going to the bathroom more often than usual. These changes aren’t just messy; they’re a clear signal your dog’s gut isn’t working right.

Lethargy and weakness are other key symptoms to watch for. If your normally energetic pup suddenly doesn’t want to play, struggles to keep up on walks, or sleeps more than usual, hookworms could be the cause. Since the worms steal blood, your dog might become anemic, leading to pale gums and tongue—something you can check easily by lifting their lip. Anemia makes it hard for their body to carry oxygen, leaving them feeling drained.

Appetite changes are common too. Some dogs with hookworms will eat more than usual but still lose weight—their body is trying to make up for the nutrients the worms are taking. Others might lose interest in food altogether, turning away from their favorite treats or meals. Weight loss can happen quickly, especially in puppies or smaller dogs, so even a few pounds gone should prompt a closer look.

Skin issues might pop up too, especially around the paws. Hookworm larvae can burrow into your dog’s skin, causing red, itchy bumps or a rash. You might see your dog licking, chewing, or scratching their paws more than normal, and in severe cases, the skin could become raw or infected. If your dog spends time in grassy, damp areas—where hookworm larvae thrive—this is an extra symptom to keep in mind.

Remember, many regions require regular parasite prevention for dogs, not just for their health but to avoid spreading hookworms to other pets or even humans (kids and people with weak immune systems are most at risk). If you spot any of these symptoms, don’t wait to call your vet—they’ll run a simple stool test to confirm hookworms and prescribe treatment. Catching it early helps your dog recover fast, and sticking to a regular prevention plan keeps them safe long-term.