First off, I have to agree, get rid of the flea collars and get something from the vet. Most of the over the counter things are ineffective and often unsafe.

Letting cats outside is also not a good idea..there are so many dangers, even in a good neighborhood or the country. Outside cats have a much shorter life span then indoor cats.

As to the behavior, it could be many things. Having been near another cat, having gotten into something oderous that you can't smell but to a cats nose is blatant, or something just plain scary.
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PHTessie

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