You are probably unaware of this issue, as it is not a problem on my desktop or laptop, however I generally use my iphone to shake paws, so scalability (if that's what the issue is) is really important to me.
For some time there has been an issue with Lisa's page being too wide for my iphone 4s screen, so that I have to scroll to the right to shake paws (and now to feed as well). Spider's page has also had this problem intermittently.
Only this week, two other user's (admins, I think) pages also became too wide as well (one a couple of days ago and another today).
It's not impossible, but it does slow me down and make the experience less simple and enjoyable (particularly if I'm in a rush to shake and feed as many as I can as quickly as possible on a busy day)...