FRONTLINE Plus for Dogs Medium 23-44 lbs - 6 Doses (Blue Box)

In this review of FRONTLINE Plus for Dogs, the bottom line is straightforward: this is a reliable topical flea and tick treatment for medium dogs weighing 23-44 lbs, and its single biggest selling point is the combined fast-acting and long-lasting control of adult fleas, eggs, larvae and ticks. The reviewer found it especially useful for owners who want a waterproof, easy-to-apply option that treats the whole animal from a single application point. This package contains six monthly doses, making it a practical choice for multi-month protection.

Key Features

• Broad parasite control: Formulated with fipronil and (S)-methoprene to kill adult fleas, flea eggs and flea larvae, helping break the flea life cycle.
• Tick protection: Kills ticks that can transmit Lyme disease, reducing exposure risk during outdoor activity.
• Waterproof formula: Stays effective after swimming or bathing so owners do not need to worry about immediate reapplication.
• Long-lasting coverage: Each monthly dose protects for an extended period, and the six-dose box supports continued treatment without frequent repurchasing.
• Easy application: Applied to a single point on the skin, the topical distributes across the body via the sebaceous glands for full coverage.
• Puppy-safe minimums: The formulation can be used on puppies aged eight weeks or older and weighing at least 5 lb, providing flexibility for mixed-age households.

Who It's For

FRONTLINE Plus for Dogs is best for pet owners of medium-sized dogs (23-44 lbs) who want a dependable, month-to-month topical that handles both fleas and ticks. It suits households that need a waterproof option and the convenience of a multi-dose pack to cover several months without repurchasing every month.

Owners who prefer oral treatments, prescription-only products, or have dogs with specific sensitivity to topical ingredients should consult a veterinarian and consider alternatives. The box is aimed at routine prevention rather than single emergency treatments.

Pros & Cons

Pros

• Effective combination of active ingredients targets adult fleas plus eggs and larvae to help prevent reinfestation.
• Provides tick control to reduce risk of vector-borne disease during outdoor exposure.
• Waterproof and long-lasting, so normal swimming or baths do not automatically negate protection.
• Six-dose pack is convenient for ongoing monthly prevention without frequent shopping.

Cons

• Topical application may not suit dogs or owners who prefer oral medication or have concerns about skin sensitivity.
• Not specialized for other parasites beyond fleas, eggs, larvae, lice and ticks, so additional products may be needed in some cases.

Specifications

Product name	FRONTLINE Plus for Dogs (Medium, 23-44 lbs) 6 Doses
Active ingredients	Fipronil and (S)-methoprene
Target pests	Adult fleas, flea eggs, flea larvae, chewing lice, ticks
Formulation	Topical, waterproof
Pack size	6 monthly doses (blue box)
Minimum age	Can be used on puppies 8 weeks or older

Our Verdict

FRONTLINE Plus for Dogs is a practical choice for medium dogs when reliable, broad-spectrum monthly flea and tick control is the priority. The combination of fipronil and (S)-methoprene, waterproof formula and six-dose pack make it cost-effective and low-hassle for ongoing prevention, though owners who prefer oral options or need treatment for other parasites should consider alternatives or veterinary advice.

Frequently Asked Questions

Can I use this on a dog that swims often?
Yes, the waterproof formula remains effective after swimming or bathing, so routine activity does not require immediate reapplication.

How often should I apply the treatment?
Apply one dose monthly; the six-dose box provides coverage for six months when used as directed.

Is this safe for young puppies?
It can be used on puppies aged 8 weeks or older who weigh at least 5 lb, but consult your veterinarian if you have concerns about sensitivity.