Most households stop flea prevention when summer ends, and that is precisely backwards. Flea numbers peak in late summer and autumn after a season of breeding, and once the heating comes on, a warm house lets the cycle continue straight through winter. The worst infestations we see start in October.
Why autumn is peak season
Fleas need warmth and humidity. A whole summer of both produces the largest population of the year by about September, and that population then looks for somewhere to spend the winter. Your house, with the furnace running and carpet underfoot, suits them far more than the garden.
The other reason is arithmetic. What you see on your pet is a tiny fraction of the problem. The adults living on the animal represent a small share of the total, while the overwhelming majority exists as eggs, larvae and pupae in carpet, bedding, cracks in flooring and the back of the sofa.
Those pupae are the part that catches people out. They can sit dormant for months and hatch in response to warmth and vibration, which is why a house can seem clear in November and produce a wave of fleas when the heating goes on or after a weekend away.
What you will actually notice
Not fleas, usually. What owners see is the consequence:
- Scratching, particularly along the back, the tail base and the hind legs
- Nibbling or chewing at the base of the tail or the inner thighs
- Small scabs along the back, most often felt rather than seen, which is classic in cats
- Thinning fur over the rump and the backs of the legs
- Restlessness, over-grooming, or a cat who suddenly grooms in bursts
- Flea dirt: specks that look like black pepper in the coat and turn rusty red on a damp piece of white paper
- Bites on human ankles, which often arrive before anyone suspects the pet
Cats are the hard case. A fastidious cat grooms adult fleas off so efficiently that you may never find one, while the skin damage carries on. If your cat has scabs along the spine or is pulling fur from the belly, fleas are worth ruling out first even with nothing visible.
Why it is not just itching
Flea allergy is the most common skin allergy in dogs and cats here, and an allergic pet does not need an infestation. A single bite can set off two weeks of intense itching, which is why the pet who is clearly reacting is often the one with the fewest fleas on them.
Beyond the itch, heavy burdens cause anemia in kittens, puppies and frail older pets, which can be serious, and a blood test through our pet diagnostics service will show whether it has happened. Fleas also carry tapeworm, so a pet who swallows one while grooming picks up a second parasite. And a scratched, broken skin surface becomes infected, which turns a nuisance into something that needs proper attention.
If your pet is uncomfortable, our medical services team can sort out what is actually driving the itch, because fleas, mites, allergies and infection all look like a scratching pet from across the room.
Dealing with it properly
The mistake that keeps households in a cycle for months is covering the pet and ignoring the house.
- Cover every pet in the home, including the cat who never goes out and the pet who is not itchy. Missing one keeps the cycle running.
- Keep going for at least three months, and ideally year-round here. Stopping in November is what produces the February surprise.
- Vacuum thoroughly and often, especially along baseboards, under furniture and wherever pets sleep. Vibration triggers pupae to hatch, which is useful, since it brings them out where prevention can reach them. Empty the vacuum outside.
- Wash pet bedding hot, weekly during an active problem, and include throws and the cover on the chair they favour.
- Do not forget the car, and any crate or carrier.
- Expect it to take time. Because of the pupae, a house can keep producing fleas for weeks after you start. That is normal and not a sign the plan has failed.
- Ask us which product suits your pet rather than buying at random. Some over-the-counter dog products are dangerous to cats, and effectiveness varies enormously.
Parasite cover is part of what we review at a routine visit, and our pet care services page sets out what that appointment includes. Autumn is also when other wet-season parasites turn up, which our guide to leptospirosis and standing water in Port Moody covers.
Frequently asked questions
My cat never goes outside. How would she get fleas?
They arrive on you, on a dog, on a visiting pet, or through a door left open. Indoor cats get fleas regularly, and because they are groomed off so efficiently, they are often diagnosed late by the scabs along the spine rather than by anyone seeing a flea.
I have not seen a single flea. Can it still be fleas?
Yes, and this is the most common conversation we have about itching. Look for flea dirt rather than fleas: comb over white paper, dampen a speck, and if it smears rusty red it is digested blood. In an allergic pet, even that can be hard to find.
Can I stop prevention once the weather turns cold?
Not here. Our winters are mild and wet rather than freezing, and a heated house keeps the indoor cycle going regardless of the weather outside. Year-round cover is the simplest approach on this coast.
The flea problem came back two weeks after I sorted it. Why?
Almost always the pupae in the house hatching, or one pet in the household not covered. It is rarely product failure. Keep every animal covered, keep vacuuming, and give it the full cycle rather than stopping when things look better.
Are supermarket flea collars and spot-ons good enough?
Effectiveness varies widely, and some are not safe for cats. Ask us what to use for your specific pet, especially if you have both dogs and cats, since a product applied to the dog can seriously harm the cat who grooms them.
Should I be worried about tapeworm?
It is worth knowing about rather than worrying about. Pets swallow fleas while grooming, and some fleas carry tapeworm. If you see rice-grain segments around your pet’s back end or on their bedding, mention it when you call, because it changes what we recommend alongside the flea plan.
Speak to the team at Newport Village Animal Hospital
If your pet is scratching, or you want to get ahead of the autumn surge, phone us and we will sort out a plan for every animal in the house.
Published by the team at Newport Village Animal Hospital.
This article is for general educational purposes only and is not a substitute for an in-person veterinary examination or advice about your individual pet. If you have an urgent concern about your pet, contact Newport Village Animal Hospital or your nearest emergency veterinary hospital right away.
Newport Village Animal Hospital
276 Newport Dr, Port Moody, BC V3H 5B9
Phone: (604) 492-3900
Email: vetsnewport@gmail.com
Hours: Monday to Friday 8:00 AM to 8:00 PM; Saturday and Sunday 9:00 AM to 7:00 PM