What this means
An adult flea lives on the dog, but its eggs, larvae and pupae are in the surroundings: the bedding, carpets, the sofa. So finding one flea generally means there are more, and what you can see in the coat is only a small part of the whole problem.
The traces are usually easier to spot than the fleas themselves. Tiny black specks in the coat are flea droppings: if you brush some onto damp white paper and they leave a reddish-brown smear, that is blood. The usual places are the back near the base of the tail, the belly, the groin and the insides of the hind legs.
Some dogs barely react to fleas, others react strongly after just a few bites. An allergic dog can scratch fiercely, with red skin, scabs and bald patches following. So it is not always a matter of a quick fix, and if the itch is severe it is worth talking to a vet.
Possible causes
These are things that can cause this sign. It is not a diagnosis, and they are not equally likely for your dog.
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Fleas from another animal or the surroundings
Fleas jump across from another dog or cat, from grass, from dog play areas, or from premises where they have already settled.
About the condition: Fleas -
Allergic reaction to flea saliva
Some dogs react to the proteins in flea saliva. A few bites are enough for fierce itching, redness and bald patches at the rear end of the back.
About the condition: Allergies (food, skin and environmental) -
Skin inflammation from scratching
A dog that scratches damages its skin. Redness, scabs, sores and sometimes a bad smell follow.
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Other external parasites
Itching can also come from other mites or lice. If you cannot find fleas but your dog keeps scratching, the search for the cause carries on.
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The home environment
Flea eggs and larvae live in bedding, carpets and soft furnishings, so fleas can return to a dog even when no visible fleas are left on it.
What else to watch for
These observations help your vet build the picture faster. Note down what you saw and when.
- Whether black specks or moving fleas are visible in the coat
- Which parts of the body your dog scratches or chews most
- Whether the skin is red, scabby or has bald patches
- Whether other pets in the house are also scratching
- Whether tiny black specks show up on bedding or the sofa
- Whether people in the house have small bite marks, especially on the legs
When to book a routine visit
Book a visit if you see fleas or their traces, especially if your dog is very itchy, the skin is red or there are bald patches. Tell your vet which parasite products you have used and when, and whether other pets at home have fleas. Do not use products made for another species on your dog without asking a vet.
Related conditions
Conditions whose entries mention this sign. The list is somewhere to read on, not a way to reach a diagnosis.
- Allergies (food, skin and environmental) Skin and coat An allergy is an overreaction of the immune system to substances that are essentially harmless, such as pollen, house dust mites, moulds, flea saliva or an ingredient in food. In dogs it shows up mainly in the skin and ears, and constant itching wears a dog down and can open the way to skin infections. More than one trigger can be involved at once, so finding the cause takes patience.
- Atopic dermatitis Skin and coat Atopic dermatitis is a long-term allergic skin disease driven by an inherited tendency: the skin overreacts to environmental allergens such as pollen, house dust mites or moulds. These dogs have a weaker skin barrier, so allergens get in more easily, and scratching irritates the skin even further. Signs can begin in young dogs and, depending on the allergen, may flare up at certain times of year.
- Skin infections Skin and coat Skin infections are caused by bacteria or yeast that start to multiply when the skin's defences are weakened, for example by an allergy, parasites, moisture trapped in skin folds or constant scratching. An infection can stay on the surface or reach the deeper layers of the skin, causing pain and intense itching. What caused the infection and what keeps it going is for a vet to work out.
- Fleas Parasites Fleas are small, jumping parasites that feed on a dog's blood and cause itching. Some of them live on the dog, while the eggs, larvae and pupae live in the home: in the dog's bed, carpets and soft furnishings. That is why fleas can keep coming back even when none are left to see on the dog; your vet can advise on protecting your dog and your home.
Body systems: Skin and coat Parasites