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Even just one (long gone!) flea could cause long-term itching...if she has flea allergies. I know they are pretty rate in Utah. It's a possibility.
There are definitely other parasites that are more likely to become problematic for a younger dog, so those are also possibilities. Again not super likely in Utah.
Is there any localization to the itching? I know you mentioned when you're petting her you stimulate it, but what about otherwise?
What other parasites could it be? She's been to Florida and through some other southern states/Texas where they have fleas and although I never found fleas on her there's a chance she's been bit before...and if so she didn't react. But I don't know for sure, I didn't have flea preventative on her other than washing her in flea shampoo once while I was there.
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If her skin is not reddened at all, then it's probably fairly minor. If it's getting severe or chronic you will start to see skin changes in color, texture, etc. It's quite possibly nothing significant at all. Otherwise the top three causes of itchiness are probably food allergies, parasitism or atopy.
I hope Keva is itch-free soon! Maybe she is just adjusting to the heat and her coat is bugging her since it's still fairly thick (heat rash kind of thing?).