Animal fleas make merry in the warm summer weather. They don’t live on humans, but they will lay eggs in your carpets and gorge opportunistically on your ankle blood. On the plus side, if you’ve got fleas because you’ve got cats, at least you won’t have rodents.
Proprietary flea treatments are available, but often won’t be enough to annihilate the whole life cycle. You’ll have to wash all your pets’ bedding and hoover everything – carpets, curtains and soft furniture – like a maniac.