It would be a good idea to have a vet check your Sheltie out. Some pant a lot--mine panted *constantly* when I got him four years ago--made me crazy. Both his very reputable breeder and the vet assured me he was fine...he is. And he pants less now, although he still does it quite a bit when excited...which is quite often.
Cody panted a lot, and Zulu does it too. Zulu does it mostly during the day when he is active. Once he settles down in the evening, not so much, and when he does, his mouth is barely open.
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