Potty pads, pee pads, weewee pads (and other various names) were a lifesaver for us. We were apartment dwellers for 6 years with our oldest, 3 years with the second and 2 years with the youngest.
We discovered the washable kind after we got the house....(could have saved a fortune on the disposables).
We did try the dog "litter" but since our little guy was a puppy, he layed in them and chewed them....might be better after teething (???).
All hail potty pads!!!!