she takes Sentinel every month...
 
but now, let me add the rest of the story!! 
this a.m. when I took the "worm" in, the tech took it to the back and came back and said the vet said it "looked like a hookworm".  "worm" was still in the water bottle I had brought it in.  she asked if I wanted it back, when I said no, she threw it away. 
when I went to the clinic to pick up the de-wormer, the main (owner) vet was luckily in the outer room.  I asked him if I could talk to him a minute, told him what happened and asked the receptionist to get the water bottle from the trash can.  it was still there.  he took it and said he would look at it through a microscope.  I assumed that's what the vet did this a.m.!!!!  he called me into an exam room and said it was some sort of fiber, that looking at it with a microscope he couldn't find any kind of g i tract or anything he would expect in a parasite.  he pulled it apart with tweezers and said it was very tough, as well. 
so, long story shorter, had I listened to the young vet the tech talked to this a.m., I would have given my Maddie de-wormer for a piece of fiber in her water!  this is very well renown vet clinic, even though we are in a rural area.  I am very disappointed the vet this a.m. didn't even take the time to check this out.  I was upset when I left, but will visit again with the "head" vet to let him know the whole story and how I feel.  I don't know if giving her a de-wormer when she doesn't need it would hurt her or not, but don't believe in giving her something if she doesn't need it. 
