With only ten rats, you can easily dispose of all fleas that may be on the adults by giving the rats twice-weekly baths using an anti-flea cat shampoo. Be sure to replace the rats' bedding each time that you bathe them. This will take three weeks, but will work. As for the five babies - if you intend to feed them off, just give them one bath in warm water without shampoo, to remove any living fleas. If any eggs remain on them (and there probably won't be), their consumption by your snakes will do the snakes no harm.
Bathing, using the above regimen, is also helpful in ridding rats of lice, and scabies. Used in conjunction with oral or injected treatment by certain drugs (Ivermectin is most commonly used - two doses at a ten-day interval, and is highly effective), you can eliminate all ectoparasites from your rat population within 21 days. Following such treatment, you need to ensure that you routinely quarantine and treat any new animal that you bring into your home, prior to permitting it to have any contact with any of your resident animals.
As stated by other respondents - don't feed off any drug-treated animal for at least ten-to-14 days after the final treatment. Although, if your snakes HAVE ectoparasites, feeding treated prey would be a means of treating the snakes, provided that the drug used was one that is also used for cold-blooded species (i.e. Ivermectin).
>>I got a kitten that had fleas and so fleas were in my living room. The kitten is gone now, but the fleas remain. I plan to bug bomb my downstairs area (living room, dining room, and kitchen areas) on Friday, but wonder if my rats would have fleas. They are mostly dark colored so I don't know if I would see any. I plan to put the rats' cage in my bedroom (where my cats stay), but if they have fleas, they might spread it to my cats, and vise versa. How do you treat fleas on rats? I would like to do what I can as a precaution before returning the rats to the living room after things are safe after the bug bomb. I have 2 boys, 3 girls, and 5 babies (under 1 week old).
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>>At least my backyard is already treated and my dogs are on flea prevention medication. Now to take care of the house in sections, the cats, the rats, and keeping my roaches, snakes, and birds (including babies) safe...sigh
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tricia