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If it is available, my best topical flea treatment for cats is Cheristin. It is very effective and kills fleas before they bite, which is helpful for cats with flea allergies since it is the bite they react to. Comfortis is a tablet that is also very effective, but it can cause vomiting.
You may benefit from contacting the company directly and asking for coupons or free samples. You might consider giving your local SPCA or discount clinic a call as well. They may know more about discounted options in your area.
I like advantage better than Frontline. That said, some veterinary office will sell flea products one unit (one month) at a time. They only require a physical exam once a year most likely, so they can establish a patient client relationship. I really like revolution or Comfortis for flea medicine but if you have to pick between advantage and frontline I prefer advantage. You could also alternate advantage one month, frontline one month then go back to advantage. Thank you for using Boop by Petco.
Thanks for using Boop by Petco! Thankfully, you have a few options here. I recommend you consider using a product called Capstar which is to kill a lot of fleas at once to complement a flea preventative product like Advantage. You can go ahead and give another dose of Advantage now as well. I would not give up on Advantage just yet. Continue to use it for now as this flea may be was a one time occurrence and the Advantage was still being effective. Another option is switching to Bravecto now though again Advantage may still be effective so it may be best to exhaust its use. Good luck and have a great day!
Hello. I do not know what might be available in Canada, but I highly recommend looking at this website for the Veterinary Oral Health Council. Click on the Accepted Products link at the top, then on accepted products for cats. It will list everything that is truly tested to provide results. Thanks for using Boop by Petco. https://www.vohc.org