Anything Patterdale, expect to live life at 100mph
But different X Barney is a Patterdale/Cocker Spaniel, so 2 crazy breeds in one
He never used to be at all aggressive toward other dogs, too friendly in some instances, when I had to go running after him as he'd seen another dog to greet on the other side of the field (his re-call has never been 100%).
BUT over the years he's been attacked by bigger dogs, with stupid unthinking owners and if he's approached now he will quite often show teeth and snap as a warning, but only if the dog is bigger, still great with smaller dogs and lets face it he lives with and is great friends with Yogi the cat.
He's 13 in January with a few health probs so he's slowed down now considerably. When he was younger you could take him on a marathon walk and after a quick nap he'd be at 100% battery again. So good luck