Just like others have mentioned, it is difficult to find where fleas originated first before your cat and dog got them. But you can try and see where they hide within your home and determine how to get rid of them from there. Another member of this forum explained to me, that if you placed an pie crust pan filled with water and some dawn soap on the ground and put a lamp around that pie crust pan overnight, you'll see how many fleas are within a certain areas. Fleas love light and heat. The lamp provides for that and the water reflects the light, making it brighter than the rest of the room. So they jump in and drown. It's not only a great way to find out where most of your fleas are hiding, but a great way to eliminate some of your flea swarms, too!
Hopefully this helps. Good luck to your sister and her pets!
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