Fleas do persist in winter, especially indoors. Key signs are an itchy pet (scratching, biting, hair loss), “flea dirt” (black pepper-like specks that turn red when wet), tiny brown jumping insects, and itchy bites on your ankles or waist in small clusters.

 

What you’ll see on pets

 

• Frequent scratching, nibbling, or head shaking; restlessness at night.
• Thinning hair or sore “hot spots,” especially at the base of the tail, neck, belly, groin, and armpits.
• Flea dirt: tiny black specks on skin/comb; smear on a damp tissue turns reddish (digested blood).
• Live fleas: small, flat, reddish-brown, fast, and jumping.

 

What you’ll see on people

 

• Itchy red bumps (often 2–3 together) on ankles, lower legs, waistline, or where clothing is snug.
• Bites appear quickly after sitting on carpets/sofas or near pet bedding.

 

What you’ll see in your home

 

• Black specks on pet beds, seams of sofas, throw blankets, and along baseboards.
• Sudden “burst” of fleas after turning on heat or after vacuuming (pupae hatching).
• Activity in warm, humid spots: laundry rooms, carpets, rugs, car interiors, garages.

 

Simple ways to confirm

 

• Flea comb your pet over white paper; look for fleas or flea dirt that reddens when damp.
• White sock test: walk on carpet; fleas jump onto socks.
• Lay a white towel where your pet sleeps overnight; check for specks or live fleas in the morning.

 

Why winter fleas fool people

 

• Indoor heating keeps eggs and larvae developing; pupae can “pause” for weeks then hatch when they sense warmth and vibration.

 

How to get rid of fleas in winter

 

Fleas stay active indoors year‑round. To end them: treat every pet with a vet‑approved flea killer and growth regulator, deep‑clean your home, treat soft surfaces with an insect growth regulator (IGR), and repeat until all life stages are gone. Expect 3–8 weeks for complete clearance; keep pets on monthly prevention to stop reinfestation.

 

Treat every pet

 

• Use vet‑approved oral/topical products (e.g., isoxazolines like fluralaner/sarolaner; spinosad; fipronil). Treat all pets the same day.
• Choose products that kill adults fast and include an IGR or pair with an IGR spray for the home.
• Flea‑comb daily; dip comb in soapy water to drown fleas.
• Do not skip monthly doses through winter.

 

De‑flea your home

 

• Vacuum daily for 7–10 days; focus carpets, rugs, pet beds, under furniture, baseboards, sofa seams. Empty vacuum into a sealed bag outside.
• Wash pet bedding, throws, and linens hot (≥60°C/140°F) and hot‑dry.
• Apply a home IGR spray (methoprene or pyriproxyfen) to carpets, cracks, and furniture; avoid using foggers alone.
• Steam clean carpets/upholstery, or lightly apply food‑grade diatomaceous earth, then vacuum after 24–48 hours.
• Dehumidify to under 50% RH; larvae struggle in dry air. Treat cars and pet carriers.

 

Timing and follow‑up

 

• Pupae in cocoons can survive weeks; bites may continue 2–4 weeks.
• Re‑treat the environment in 14 days if you still see fleas.
• Maintain prevention for at least 3 months.

 

Safety

 

• Ask your vet for age/weight‑safe products; never use dog meds on cats.
• Keep kids and pets off treated areas until fully dry.
• Avoid essential oils on pets (especially cats). Call a pro for heavy infestations.