Fleas on Cats: Why They Often Appear in the Colder Months
Many cat owners are surprised to see fleas during autumn and winter, assuming they are only a “summer problem”. In reality, we frequently diagnose flea infestations in the colder months, and there is a very good reason for this.
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Diagram from https://commons.wikimedia.org/
The Link Between Fleas and Central Heating
Fleas have a complex life cycle. While adult fleas live on pets, the majority of the flea population exists in the environment as eggs, larvae and pupae. Flea pupae are particularly hardy and can remain dormant for months in carpets, floor cracks, soft furnishings and pet bedding.
When central heating is switched on, homes become warmer and drier — ideal conditions for flea pupae to hatch. This sudden increase in temperature effectively “awakens” dormant pupae, leading to an unexpected surge in adult fleas on your cat, even though it may be cold outside.
Why Over-the-Counter Flea Treatments Often Fail
Many flea treatments available without prescription are no longer reliably effective. This is not necessarily due to incorrect use, but because fleas have gradually developed resistance to certain active ingredients.
Resistance develops when fleas that are naturally less susceptible to a product survive treatment and go on to reproduce. Over time, this results in a flea population that the product can no longer control effectively.
It is important to understand that it is the flea that becomes resistant, not the cat. Unfortunately, this also means that even the products we currently rely on will eventually become less effective, which is why veterinary parasite control recommendations change over time.
Photo from madsenpest.com
Why Veterinary Advice Matters
For effective and reliable flea control, we strongly recommend consulting your vet. Prescription-level flea treatments are evidence-based, regularly reviewed for resistance patterns, and far more dependable than most over-the-counter products.
In the UK, it is now a legal requirement that a vet must physically examine your pet before prescribing:
- Anti-parasite treatments (including flea products)
- Anti-infective medications (such as antibiotics)
This ensures treatments are safe, appropriate, and genuinely effective for your individual pet.
Accessing Flea Treatments Through Vet2Cat
Once your cat has been examined for the purpose of flea treatment prescribing, Vet2Cat can:
- Supply prescription flea treatments directly from the practice, or
- Provide a written prescription for use elsewhere
We also offer the convenience of our online shop, where prescription flea products can be ordered, provided we have seen your cat in accordance with prescribing regulations.
Photo by Siarhei Palishchuk on Unsplash
Treating the Home Is Essential
Successful flea control does not stop with treating your cat. Because most of the flea life cycle occurs in the environment, household treatment is critical:
- Vacuum carpets, rugs, sofas and skirting boards thoroughly and regularly
- Use an appropriate household flea spray as advised by your vet
- Wash all washable pet bedding and blankets on a hot cycle
- Dispose of vacuum contents immediately after cleaning
Without environmental treatment, re-infestation is extremely common. AND REMEMBER TO TREAT ALL THE WARM-BLOODED PETS IN THE HOUSE!
Photo from flea combing a patient. Red arrow = live flea, blue arrow = flea 'dirt' (= poo!)
A Note From the Vet2Cat Team
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