Advantix II - Flea & Tick Medicine

TL;DR: K9 Advantix II is a monthly spot-on flea and tick topical for dogs 8 weeks of age and older, applied between the shoulder blades to affect fleas, ticks, lice and mosquitoes on contact — no bite required. It comes in four weight-based sizes (Small, Medium, Large and X-Large Dog) and is not for use on cats.

Because K9 Advantix II works on contact, parasites are affected before they bite. That contact action makes it a common choice for dog owners managing peak flea and tick season.

Shopping for k9 advantix ii canada-wide? Ashario Pets stocks it alongside other parasite-control topicals for dogs.

Key features

• Affects fleas, ticks, lice and mosquitoes on contact — parasites do not need to bite.
• Monthly topical application between the shoulder blades.
• For dogs 8 weeks of age or older; match the variant to your dog's current weight.
• Waterproof after 24 hours, so it stays effective after swimming or bathing once dry.
• Available in Small Dog, Medium Dog, Large Dog and X-Large Dog sizes.
• Do not use on cats; keep treated dogs away from cats during close contact.

Specifications

Attribute	Value
Brand	Advantix
Product type	Topical parasite treatment (spot-on liquid)
Species	Dogs only — not for cats
Minimum age	8 weeks
Application	Monthly, between the shoulder blades
Small Dog weight range	Up to 4.5 kg (10 lb)
Waterproof	Yes, after 24 hours
Size variants	Small, Medium, Large, X-Large Dog (4 options)

Who is it for?

This flea and tick topical suits dog owners who want monthly, broad-spectrum coverage against fleas, ticks, lice and mosquitoes. The four size variants let you match the dose to your dog's current weight rather than estimating.

The Small Dog size covers dogs up to 4.5 kg (10 lb), and the 8-week minimum age makes it a practical 8 week puppy flea treatment option once your puppy falls within a labelled weight range. It is not suitable for cats, and multi-pet households should separate animals during and after application.

How do you apply K9 Advantix II?

Part the fur between the shoulder blades and apply the full contents of the tube directly to the skin. Repeat once a month, and allow 24 hours before bathing or swimming so the product can become waterproof.

Re-check sizing as puppies grow, since a dog can move into the next weight range within a few months.

Feeding & use

This is a topical product, not an oral one — it is applied to the skin and never given by mouth. Apply once every 30 days for continuous coverage, including year-round use in regions with mild winters.

If you are comparing formats, see Advantage II - Flea & Tick Medicine for small dogs, the kitten-specific Advantage II - Flea & Tick Medicine for cats under 2.3 kg, or Capstar - Fast Acting Oral Flea Treatment if you prefer an oral option.

Available for same-day pickup at our North York, Toronto storefront, or ships Canada-wide.