I already have one and I love it but recently I moved in to a 2-story ...

I already have one and I love it but recently I moved in to a 2-story condo, so I decided I needed another. With that said, now I know there are at 2 DIFFERENT SIZES. I have 2 small Chihuahuas, the 1st I bought uses the 22x22 pee pads perfectly. However, the new one that just arrives is much larger than the pee pads I buy.

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