I would like to think that she is Anita's sister or cousin. Since if they just sold a stranger one of the original 101 I dunno seems ceremonial not to give him to just any person.

Too bad the movie never explained how she got him. Maybe the movie wanted us to wonder and come up with our own reasons.
Same thing with how the Oompa Loompas reproduce when they clearly show no female ones. An (U)n(E)xplained (M)ystery.
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maybe the Dearlys sell dalmatians as their reputation or Chloe is a cousin of one of their's so she got one of their dogs. Too bad the movie never explained how she got him. Maybe the movie wanted us to wonder and come up with our own reasons.
http://s10.invisionfree.com/Nova_Infinity/

Haha! When People think Chloe is Roger and Anita's daughter she aged 30 years in 3 years!

Yeaand the movie is set "3 years later" because when Cruella turned evil in 102 dalmatians she said this "For which I had lost3 years of my life!!"
Soit's been 3 years and all the dogs are grown-ups.

Ok, thanks. It's all starting to make sence now!

Chloe isn't Anita and Roger's daughter, I think she's just a "friend of thiers", someone who they knew. She got dipstick off them.
The reason all the dogs changed is because of the amount of time between the first film and this film - the puppies in the first film are now grown dogs.