Okay, this is a wild shot.
I look at this dog and it scratches some recognition in my brain, but I can't place it. At first I though Mudi, but that's not it. What it is, is some southern european or eastern european regional herding breed, like a Basque Shepherd or something like that, at least partly in it's breeding. Which is why it looks 'herdy' to many of us, but we can't put our finger on a specific breed...because it's a breed/landrace that isn't 'Kennel Club' hence not seen much.
The other bit is that it could be a multi-generational mutt mix, with many different breeds in it's background including a lot of the herding breeds, but so mixed together and so mixed with other non-herding dogs that it all becomes impossible to parse out.
Finally, appearance can play a big part in figuring out a dog's makeup, but behavior is also a big part. Does it show any interest in herding? In fetching/retrieving? Interest in pointing/flushing? Fascanated by certain scents?