Best K9 Advantix Dog Flea Drops in 2026

K9 Advantix II Large Dog 30-day treatment & prevention protects dogs 21-55 lbs. from fleas, ticks, mosquitoes, biting flies and lice

Kills fleas within 12 hours of application

Vet-recommended formula kills & repels on contact so fleas don’t have to bite your dog to die

Waterproof flea and tick treatment for dogs: Frontline Plus for Dogs provides waterproof, fast-acting, long-lasting flea and tick treatment and control for your dog. This product is approved for use on dogs 45-88 lbs.

Break the flea life cycle with Frontline: Frontline flea and tick treatment for dogs kills adult fleas plus flea eggs and larvae to stop existing infestations and prevent establishment of new infestations.

Kills fleas and ticks: Frontline flea and tick treatment for dogs kills fleas, flea eggs, lice, and ticks. This flea and tick treatment kills ticks, including those that may transmit Lyme disease.

EFFECTIVE, WATERPROOF FLEA TREATMENT FOR DOGS: PetArmor Plus is a waterproof, flea & tick topical prevention for dogs that kills fleas, flea eggs, flea larvae, ticks, and chewing lice for up to 30 days after application.

TRUSTED, VET QUALITY FORMULA: Containing fipronil and (S)-methoprene, the same active ingredients as FRONTLINE Plus for Dogs. PetArmor Plus for Dogs has a powerful formula that starts to kill fleas within 24 hours.

BREAK THE FLEA CYCLE: Unlike other flea and tick treatments that may temporarily suppress flea activity, PETARMOR Plus Dog Flea Treatment works by effectively breaking the flea life cycle. Kill flea eggs and larvae to prevent re-infestation.

COMPARE TO K9 ADVANTIX II: Activate II uses Imidacloprid, Permethrin, and Pyriproxyfen - the same safe, fast acting active ingredients used in Advantix II for Dogs. Includes four (4) monthly doses

ACTIVELY PROTECTS YOUR DOG: Activate II is approved by veterinarians to repel and kill fleas and ticks on contact - before your dog is exposed to bites and potential flea borne illnesses

STOP INFESTATIONS FAST: Our topical drops prevent infestations by breaking the flea life cycle - our insect growth regulator (IGR) starts killing flea eggs and larvae within 12 hours of application

Vet recommended flea treatment and prevention for dogs at weighing 21 to 55 lbs., at least 7 weeks of age

Kills adult fleas, flea larvae and flea eggs for total flea prevention and treatment

Same-day effectiveness, kills fleas within 12 hours of application and keeps working for 30 days

BREAK THE FLEA LIFE CYCLE: Effectively breaks the flea life-cycle by killing all life stages of fleas: adults, eggs and larvae

ACTIVE INGREDIENTS THAT WORK: Contains the same active ingredients as Bayer K9 Advantix II for Cats (pyriproxyfen and imidacloprid)

FLEA TREATMENT FOR CATS: Kills fleas within 12 hours of drops application, and prevents reinfestations for up to 4 months

BREAK THE FLEA LIFE CYCLE: Effectively breaks the flea life-cycle by killing all life stages of fleas: adults, eggs and larvae

ACTIVE INGREDIENTS THAT WORK: Contains the same active ingredients as Bayer K9 Advantix II for Dogs (pyriproxyfen & imidacloprid)

FLEA TREATMENT FOR DOGS: Kills fleas and lice within 12 hours of drops application, and prevents reinfestations for up to 4 months

KILLS FLEAS AT ALL LIFE STAGES: Breaks the flea life cycle by killing all stages of fleas: Eggs, Larvae, and Adults. This provides a well-rounded flea treatment for dogs.

SAME EFFECTIVENESS AS THE LEADING BRAND: The SAME amount of the SAME active ingredients delivering the SAME dog flea and tick control for a lot LESS!

WATERPROOF: ZoGuard Plus for Dogs is waterproof and will remain effective even after bathing, water immersion, or exposure to sunlight. It is a great dog flea and tick treatment option for even the most active dogs.

EFFECTIVE, WATERPROOF FLEA TREATMENT FOR DOGS: PetArmor Max is a fully waterproof, flea & tick topical prevention for dogs that kills and repels fleas, ticks, and mosquitoes for up to 30 days after application.

TRUSTED, VET QUALITY FORMULA: Containing the same active ingredients as K9 Advantix II for Dogs, PetArmor Max for Dogs has a powerful formula that kills fleas within 12 hours.

BREAK THE FLEA CYCLE: Unlike other flea and tick treatments that may only kill adult fleas, PetArmor Max Dog Flea Treatment works by breaking the flea life cycle. Kills flea eggs and larvae for up to 4 weeks

Kills ALL flea life stages, including eggs

Topical drop formula kills fleas and deer ticks

Includes 3 monthly treatments in easy to apply, single dose tubes

Repels mosquitoes for 18 days

Waterproof Dog Flea Treatment: Flea medicine for dogs With waterproof, fast-acting, flea and tick topical prevention, suitable for dogs, 24 hours after use, your pet's treatment is protected from rain and water activities.

Quickly kills fleas and ticks: Flea and tick prevention for dogs with two ingredients fipronil and (s)-methoprene kills fleas and ticks quickly, when the flea medicine starts to kill fleas within 24 hours after administration.

Long-lasting Dog Flea and Tick Protection: Dog flea and tick treatment Kills fleas, eggs, larvae, ticks and chewing lice for up to 30 days, effectively breaks the life cycle of fleas and kills flea eggs and larvae to prevent re-infestation Protect your dog.

LONG-LASTING PROTECTION: Sergeant’s Guardian Topical is a flea and tick prevention for dogs that kills fleas and ticks plus repels moquitoes for up to 4 weeks.

AFFORDABLE FLEA & TICK TREATMENT: Sergeant’s Guardian Flea and Tick is an affordable way to protect your dog from fleas, ticks and mosquitoes.

QUICK-DRYING FORMULA: Sergeant's Guardian is quick drying flea and tick medication that is specially formulated for dogs over 12 weeks.