I have 4.... I got my first two at the same time Brooklynn and Bailey (they're sisters) and after that I got my biewer, Bella, and then I got my little guy, Peyton. After Brooklynn and Bailey (two period) it all feels the same! Vet bills are going to be higher but I have the money so that didn't bother me (and should I not have the money at the time, my vet lets me pay later... Food didn't seem to quadruple with four..lol I usually buy a 5lb bag and that lasts us two months... Petco didn't have any in so we bought a 20lb bag and that will last us probably close to 8 months!! lol I love my four all the same!