I looked after a ridgeback x greyhound for a lad for a couple of weeks who went on holiday. Fcuk me it was a thing, you would let it off the the lead in a field and it would keep running until it came to a hedge then turn either left or right and just keep going until it had done at least a full lap of the field boundary lol. I didn't like it and it wasn't the best working animal I had seen.