The life cycles of all fleas are basically the same.
Adults are the only flea stages spending most of their time on a host.
They leave the host occasionally and usually only when one host makes contact with another. In dogs and cats this would primarily include places in the home and kennel used for resting and sleeping. Therefore by far the greatest majority of fleas are found concentrated in the host's environment as eggs, larvae, pupae and newly emergent adults and only a small proportion of the total flea population is found on a host as feeding, reproducing adults plus newly laid eggs and hatched larvae that have not dropped off. Adult Ctenocephalides lay eggs on their hosts. These are approximateley 0.5mm long and white in color.