A homeowner reports that their pet is scratching excessively and losing patches of hair. What is the most appropriate recommendation?

When a pet exhibits symptoms such as excessive scratching and hair loss, it often indicates an underlying health issue that needs professional attention. Recommending that the homeowner take their pet to a veterinarian is the most appropriate course of action, as a vet can provide a proper diagnosis and treatment plan. The veterinarian's expertise will help identify whether the cause is due to allergies, parasites, skin infections, or other medical conditions.

While other options may seem feasible, they do not address the root cause effectively. Ignoring the symptoms could lead to worsening conditions for the pet. Applying a topical flea treatment might be suitable if fleas are indeed the issue, but without a vet's evaluation, it is not advisable to assume this is the sole cause. Changing the pet's diet could potentially help if the issue is food-related, but this too requires a veterinarian's diagnosis to ensure it is appropriate for the specific situation. Thus, consulting a veterinarian is the best recommendation to ensure the pet receives the necessary care and treatment.