Hm, does any club tattoo wolfdogs in ears? I mean as far as I know the tattooing in ears is done only in breeds where the ears do not stand, so in that case the tattoo would be unofficial, and the dog can very well be a mutt. And in that case no registry will help, I would look more in local newspapers.
And I would put out advertisements, but not tell about the tattoo number (just that there is one) so that the ones who provide it would for sure be the rightful owners.
Good luck finding the owners!
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