The flea life cycle is dependent on environmental conditions, according to the CDC. Once a flea finds a host, adult fleas ...

All cat and dog owners in the UK have been warned flea infestations at this time of year “more common than many people realise”.

The flea life cycle has four stages: egg, larva, pupa and adult flea. The entire cycle is typically complete in 3-4 weeks, but this can be quicker (12-22 days) if temperatures are ideal.