Thanks to all who responded. As soon as I get the time (I've been
really swamped lately) I'll stop by a vet's office and see if I can
get some Revolution. There are three vets within walking distance of
my house, but getting there during office hours is difficult.

In the meantime, he has now pooped once inside the house, and I think
he peed again in the same general location as the first time. I tried
the suggestion of putting some dirt on top of the litter, and I placed
it in this area, but so far he has not used it. On the other hand,
three incidents inside the house over a week or so is not that much.
Clearly he is going outside most of the time.

What bothers me is whether he really understands the idea of indoors
vs outdoors. He has been a stray living outside most of his life. I
guess I'll just have to ride with it a while to see how things
develop.

--
Bogus e-mail address, but I read this newsgroup regularly, so reply here.