Because hookworms sap a dog’s blood supply, they cause anemia. Other symptoms include weight loss, pale gums that appear grayish instead of reddish-pink, vomiting, bloody diarrhea and weakness. Itchy and irritated paws may indicate topical hookworms. A less common symptom is constipation. When the stool is finally passed, it may be hard, tarry black and tinged with blood.

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