I'm Catholic and have honestly never looked up what "we Catholics" think about animals in Heaven. It's likely that they believe that they won't be there...but here's my take.
In my opinion, Heaven is a place where everything is wonderful all the time. And to me, that means having my shelties there with me (with possibly a bit less barking)
I spent about 20 years as a Catholic myself - my favorite priest was adamant that there WOULD DEFINITELY be animals in heaven. (He raised beagles, though, so that may disqualify his opinion, LOL.)
Yes, Heaven will have Shelties, but I sincererly and reverently hope that the barking will be toned down some. <grin>
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