That's actually flea dirt when they've sucked the blood in one end, it comes out the other end as flea dirt so when water goes on it, it turns red.
Frontline is good and here in the UK we can get Frontline Combo which kills fleas wherever the cat or dog goes (on the furniture, carpet etc.)
(Mum to 12 cats, 17 snakes and one dog)
There is also another very good product but I'm not sure if it is available in the USA and that is Stronghold.
Occasionally a stray flea has lodged somewhere and a nice, warm body promising a nice, tasty meal is too much temptation!





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