I have noticed lately that my Lhasa Apso's stool seems to have what appears to be a casing around it somewhat like a sausage only it doesn't completely cover the whole stool. Does this represent a problem. The dog had a full check up less than two weeks ago. Did have tape worms and was treated for them.
I would bring a stool sample to the vet to make sure there are no more pararsites. This could also be diet related or stress related. If it continues talk to your vet about it. Good luck, vetcare