I think it depends on the type of worm or parasite you're talking about. Tapeworms are a result of fleas and you can have an occurrence thirty days after a treatment since the eggs...or whatever. I'm not a vet! lol
Anyway, take a photo or call the vet and describe. They will be the best ones to give advice and they know what's in the area, etc... and the medications/vaccines she's received.
Gizmo had a lot of parasites when we got him and the tapeworms were the biggest nightmare to get rid of. You have to do a double treatment to catch the eggs just right, and it's a good idea to be on a flea preventative as well.
You also have to deflea your house, your carpet, your yard...what a pain!
__________________ The fullness of our heart is expressed in our eyes, in our touch, in what we write, in what we say, in the way we walk, the way we receive, the way we need. -Mother Teresa ( RIP Gizmo 3/9/07-8/18/12)  |