I'm a few days late, bad.
more information, good.

my dog, Crayola is on interceptor pills for last six months just because he's a traveler too.

just something for you to know meanwhile chances in interceptor for indoor (not just strictly) animals aren't completely necessary BUT...

heartworms caused by mosquitos bites. (mosquitos that bit a dog of heartworm may infect your cat or dog).

hookworms usually caused by living creatures that cruise out of the ground out somewhere..

interesting fact, we don't have much mosquitos in this area where I live and work (south california), but we kept having heartworm blood results coming up positive. (I used to work at the vet's office) -

money racket? not always, just watch out for those symptoms;

heartworms: cough, exercise intolerent.
hookworms: diaherra, blood in stool.
there may be a few more news I don't know, it's common!