Cat flea in dogs – signs and what to do

Updated 2026-09-30 · 1 sources

Based on: ESCCAP

Book a vet visit

Book a vet appointment if you think your dog has this – a vet needs to confirm it and plan the treatment. It is a flea parasite that can infest dogs, and dogs get it when these fleas are on them.

What to do now

What you can do now

  1. Contact your vet.
  2. Note when it started, how often it happens and what else you see.
  3. Take a photo or short video to show the vet.
  4. Keep fresh water available.
  5. Let your dog rest somewhere calm.

Don't

  • Do not give any human medicine.
  • Do not wait if it gets worse.

What it is and how it spreads

Ctenocephalides felis is the most common flea species found on dogs, cats and other small mammalian companion animals in Europe.[1] Flea infestations peak in summer and autumn, but can occur throughout the year.[1] The cat flea is found on dogs and cats in Europe.[1]

Signs

  • itching
  • hair loss
  • papules and crusts on the lower back and tail base
  • flea allergy dermatitis
  • anaemia in heavy infestations

Prevention

  • Year-round flea control might be necessary.

Where in Europe it occurs

CountryOccurrence
AustriaPresent
BelgiumPresent
CzechiaPresent
DenmarkPresent
FinlandPresent
FrancePresent
GermanyPresent
IrelandPresent
ItalyPresent
NetherlandsPresent
NorwayPresent
PolandPresent
PortugalPresent
RomaniaPresent
SpainPresent
SwedenPresent
SwitzerlandPresent
United KingdomPresent

What the experts say

“While flea infestations peak in summer and autumn, studies have shown that flea infestation can occur throughout the year, thus year-round flea control might be necessary.”

If your pet is struggling to breathe, has collapsed, is having a seizure or can't stand up: go to the nearest vet now.

Not sure how serious it is?

OkPaw asks a few quick questions about your pet and tells you in 30 seconds whether it can wait. Free on Google Play for Android.

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Common questions

Where does the cat flea occur?

It is the most common flea species found on dogs and cats in Europe.[1]

When are flea infestations most common?

Flea infestations peak in summer and autumn, but they can occur throughout the year.[1]

What signs can dogs show?

Dogs can show itching, hair loss, papules and crusts, flea allergy dermatitis, and anaemia in heavy infestations.

Sources

  1. ESCCAP

How this page was made: written with the help of AI from the sources below, then checked claim by claim against those sources. Urgency levels follow OkPaw’s fixed safety rules. It is guidance, not a diagnosis. How we write our pages

The same page for cats →

Other parasites in dogs

Dog Tapeworm / HydatidFox tapewormGranulocytic anaplasmosisHarvest miteHeartwormInfectious cyclic thrombocytopenia (Anaplasma platys)Leishmaniosis (Leishmania infantum)Louping-illLungwormLyme disease (Borrelia)Skin worm (Dirofilaria repens)Tick-borne encephalitis (TBE)