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If you have a regular, healthy dog without a skin condition, "you actually don't have to wash your dog ever," says Samantha Crothers, a Melbourne-based vet at a specialist centre.

Robert Hilton, a veterinarian who practises in the field of veterinary dermatology, agrees.

"In general, healthy dogs only need to be bathed if they smell. There's no reason particularly to bath a healthy dog, unless they're dirty," Dr Hilton says.