Children Keep Getting Ringworm but the Dog Tests Negative
Pets can carry ringworm without obvious patches, and claws can be infected. But ringworm also spreads between people and from other sources, such as cats, other children at school or sports, and pets elsewhere.
Ask your vet whether a fungal culture or PCR test of your dog, and any cats, would help, since a look alone can miss carriers. Have your sons' doctor treat scalp ringworm, which usually needs oral medicine. Saliva isn't a recognized way ringworm spreads; it passes through contact with infected hair, skin and the spores they shed.
See ringworm in dogs.
This is general information, not a diagnosis. Please follow your own vet's advice.
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