Any guesses what kind of dog this is?

When we got her from the shelter, they told us she was a no-shed cairn terrier mix. They were very wrong lol. This dog sheds so much. She’s got a yellowish/tan undercoat under the wiry gray fur that comes out twice a year.

At first I thought she was a Berger Picard mix, but apparently those are really rare, especially where I live (there’s maybe 4 breeders in the country) so I don’t think this is the case.

She’s such a good dog, and I’ve never seen another one like her before. I wish I knew what she was so I could get another - she’s already 12 😭