Unless you specifically saw it come out, then no... not possible.
If you still um, have it, a picture would be helpful. But parasitic worms don't have legs... so... it must have gotten stuck to your dogs area back there and dropped off when you were looking.
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My cat is smarter than your honor student.
Stop Dog Fighting ~ Neuter Mike Vick!
~ RIP Timmy ~ May 2009 - November 6th 2009
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