I have had two encounters with bears with my V's.
My first encounter was back in the early 1980's, with my first V - Shonie. We were on a week long back packing trip out of Mineral King. On the fourth day, and about 30+ miles into our week, we made camp in a large meadow and shared a campsite with a gentleman and his grandson. He shared some of his fresh caught trout for some of my single malt scotch. Not to far away from us was a group of 15 or so Sierra Clubbers. Had met a back country ranger on the trail that day and he told me that bears were active in the area and to be sure to hang my food from a tree. No bear boxes where we camped.
Well we shared an early dinner hung our food, and to sleep early. Around 10:00 Shonie woke me up barking, very not like her, but something was disturbing her. Got up and saw 2 bears, working as a team, to get the Sierra Clubs food out the tree it was hung on. Put Shonie on her lead, kept her close, but she continued to bark eventually scaring the bears away. Then I caught all kinds of grief from the Sierra Club people for having brought a dog into the back country. Pointed out that her barking had scared away the bears and saved their food, but they weren't having any of that. Two hours later the bears were back, Shonie barking again. Quieted her down and let the bears get the Sierra Clubs food out of the tree. Two hours after that the bears were back again and this time they went for my food, and they were no longer afraid of Shonie's barking. Just marched in, one climbed the tree, went out on the limb to far and broke it off, food and bear falling to the ground. They then proceeded to dine on my food and drink my single malt. Was a long hungry hike out.
The second time, with my second V-Nikolai, on another week long Sierra trip, stopped for the night at a high alpine meadow and shared a camp, with a couple of through hikers on the John Muir Trail. Took Nikolai's pack off him and just let him wonder around. Set up camp, had dinner and was sharing a campfire with the through hikers as it got dark. Nikolai had his dinner and had wondered off exploring. Next thing I saw was Nikolai, running at full speed out of the trees, across the meadow and stream, with a big Black Bear in hot pursuit. Then disappearing into another stand of trees across the meadow. The three of us just watched open mouthed at the scene. Fast Vizsla being chased by just as fast bear. But we all know V's have endurance and bears do not.

Said to myself, "it was sure nice having him while I did, was sure going to miss him." :'( Wasn't really much I could do except sit there. I sure wasn't going after him in the fast approaching darkness with a bear in the vicinity. All turned out for the best. About 45 minutes later Nikolai comes loping back into camp, comes up next to me and just curls up at my feet with what looked like a very satisfied grin on his face. Never saw the bear again.