Here's why:
* Dosage: The appropriate dosage of Frontline depends on the puppy's weight and age. A 5-pound puppy may not be at the right weight for the standard dosage.
* Safety: While Frontline is generally safe for puppies, there are some potential side effects, especially for young animals. Your veterinarian can determine if Frontline is safe for your puppy and recommend the correct dosage and application method.
Remember, your veterinarian is the best source of information about your puppy's health and needs.