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K9 Advantix II Adverse Reactions


A small percentage of dogs have had adverse reactions to K9 Advantix II. In addition, reactions have occured in cats that have been exposed to a medicated dog. That is why it is so important to separate your cat from a medicated dog for 24 hours.


Symptoms of an adverse reactions include:

  • Itching
  • Tingling or burning sensation
  • Scratching of the skin
  • Redness
  • Bayer, the manufacturer of K9 Advantix II, indicates that some of these symptoms will dissipate within 48 hours; however, if your pet is experiencing adverse reactions, please complete the following steps.


    Stop applying the medication



    Wash your dog with a detergent based soap

  • Use Dawn or Palmolive dish detergent. These products work the best.
  • Do not scrub the affected area, this may cause more skin irritation.

  • Please note: This process is applicable for both dogs and cats.


    Call your veterinarian



    Call Bayer Emergency Support Line at 1-800-422-9874

    Let Bayer know your dog is having an adverse reaction to K9 Advantix, by calling 1-800-422-9874. This line is staffed 24 hours a day, 7 days a week.


    Max's Tip: K9 Advantix II is deadly if ingested by a cat. Keep your cat away from a dog treated with K9 Advantix II for 24 hours.  

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