When my cat was much younger and was forced to become an indoor cat in an 800 square foot condo, he was often agitated and bullied my 100lb rotti (he was so mellow and submissive he didn't stand a chance). I hated it, but I had to put him on meds- it was for OCD in humans, and I even got the prescription filled at the pharmacy (much to the pharmacists' amusement). I stopped after a couple of years and he's now a mellow senior.

When I took my rotti out for his morning/evening pee, the cat followed us outside. After the dog died, the cat was out of sorts from his routine being disrupted, so for the first while I took him out for walks around the courtyard. Kids love him and think it hilarious that he'll go for a walk.