First, please know that I own 2 indoor dogs, was raised in a home that included 2 indoor rottweilers and a collie, and that my family does volunteer fostering of puppy litters in our home for the local humane society. On those occasions that an old dog of mine has had to be eased into the long sleep due to failing health, I, as a grown man have cried like a child. With that said, I will ask my questions. My wife and I recently bought 10+ acres in the county, where the people population is less but there seems to be a problem with packs of domesticated(?) dogs raiding livestock, and at times even threatening persons. Fearless of humans, these dog packs present a danger to adults and children alike. I carry an SP101 with JHP ammo in .38+p. Should I consider instead something along the lines of frangible slugs or what for this type of risk? Practice, practice, practice with whatever I carry yes. But, is the average 40+ pound canine a tough beast to stop?