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Frontline and Frontpro are two of the most widely recommended flea and tick treatments for dogs in the UK, but they work differently and suit different canine needs. In this article, we'll compare these two products directly to help you make an informed decision for your dog.

Frontline Plus vs Frontpro: The Key Differences

Method of Application

Frontline Plus comes as a monthly spot-on treatment. You apply it directly to the skin at the base of your dog's neck, where they cannot lick it off. The active ingredients—fipronil and (S)-methoprene—then spread across the skin.

Frontpro, by contrast, is an oral tablet given once monthly with or without food. Many dog owners find tablets easier to administer than spot-on treatments, particularly for dogs that have thick coats or dislike being touched.

Duration and Speed of Action

Both products provide month-long protection. However, Frontline Plus typically begins working within 12 hours of application, while Frontpro achieves full effectiveness within 30 minutes of administration—making it faster-acting for immediate relief from existing infestations.

Active Ingredients and Effectiveness

Frontline Plus contains fipronil and (S)-methoprene, which kill adult fleas and prevent eggs and larvae from developing. Frontpro contains fluralaner, which is a newer class of insecticide from the isoxazoline family. Fluralaner paralyzes and kills fleas, ticks, and lice through a different mechanism than fipronil.

Cost Comparison

Based on current UK pricing (2026):

• Frontline Plus: Approximately £8-10 per month
• - Frontpro: Approximately £12-14 per month

Over 12 months, Frontpro costs roughly £24-48 more annually, though many vets note the convenience factor justifies the additional expense for many owners.

Safety Profile for Pregnant and Nursing Dogs

This is an important distinction. Frontline Plus is generally considered safer for pregnant and nursing dogs, though you should always consult your vet. Frontpro contains an isoxazoline, and vets often recommend avoiding isoxazolines during pregnancy and while nursing.

Veterinary Prescription Requirements

In the UK, both products require veterinary prescription. Neither is available over-the-counter at supermarkets or online retailers without a valid prescription from your vet.

Resistance Considerations

In some regions globally, certain flea populations have developed resistance to fipronil (Frontline's active ingredient). However, resistance to fluralaner (Frontpro's ingredient) remains relatively uncommon. If your dog's fleas seem unresponsive to Frontline Plus, your vet may recommend switching to Frontpro.

Decision Matrix: Which Should You Choose?

Choose Frontline Plus if:

• Your dog is pregnant or nursing
• - You prefer spot-on treatments over tablets
• - Your dog has a sensitive stomach or history of oral medication issues
• - Cost is a primary consideration
• - Your vet has had consistent success with Frontline in your area

Choose Frontpro if:

• You prefer the convenience of once-monthly tablets
• - Your dog has thick, water-resistant coat that makes spot-ons difficult
• - Your dog's fleas appear resistant to fipronil
• - Your dog has no history of isoxazoline sensitivity
• - Your dog dislikes being touched or handled for grooming

Special Considerations for Different Dog Types

Small Dogs (Under 10kg)

Both products come in weight-specific formulations. Ensure you purchase the correct weight range, as overdosing can cause neurological side effects.

Dogs with Sensitive Skin

Some dogs develop mild skin irritation from spot-on treatments. If your dog has sensitive skin, consult your vet about whether Frontpro tablets might be a better option.

Dogs with a History of Seizures

Isoxazolines (including Frontpro's fluralaner) have rarely been associated with neurological side effects in dogs with a predisposition to seizures. If your dog has seizure history, Frontline Plus may be the safer choice. Always discuss with your vet.

Final Veterinary Recommendation

Both Frontline Plus and Frontpro are effective, safe products when used as directed. The choice between them depends on your dog's individual needs, your preferences regarding application method, and your dog's medical history. We recommend discussing both options with your vet at your next appointment.

Disclaimer: This article is for informational purposes only and should not replace professional veterinary advice. Always consult your veterinarian before starting any flea or tick treatment for your dog, especially if your dog is pregnant, nursing, on other medications, or has a history of health conditions.