Yes, fleas can be harmful to dogs. Fleas are not only a nuisance, causing itching and discomfort to dogs, but they can also lead to more serious health issues. Fleas can cause allergic reactions in some dogs, leading to skin irritation, hair loss, and even infections. Additionally, fleas can transmit diseases such as tapeworms and Bartonella, which can further compromise your dog's health. It's essential to prevent and treat flea infestations to keep your dog healthy and comfortable.

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Topics covered in this question:

Prevention Dogs Health Fleas Diseases