I think some of the “accidents” with various kinds of fence are the fault of the individual horse injured or how the horses are managed. Example would be too many in a paddock or barnyard, no room to move away. Very agressive horse after another horse all the time, when agressive horse needs to be kept alone or with horse he won’t chase. I have seen injuries with every kind of fence. No food to nibble or graze on. All management issues. No one fence is ever perfectly safe for horses.
We have come to think it is Darwin’s theory in practice with certain animals or families of horses that seem to always get hurt. Some horses are just too stupid to survive. You can’t fix that or train it out of them. There is no safe fence when they get excited and brains fall out. They are wIlliing to run thru wood and wire to “get their way” or react badly to a situation. At that point you can only hope fences will withstand the impact to keep horse contained.
We do not own such horses, do not overcrowd paddocks or pastures, no terribly agressive horses chasing others. My fences are high tensile wire, that is feared by horse owners. Hated only second to barb wire. This fence has 8 strands of hot wire, fencer is always on. This was the recommended method of installation by the manufacturer, put in by professionals. I consider it money well spent, has been great fence for us over many years with minimal injuries. I am saying not even 10 fence injuries in 30 years, with a quantity of various breeds and ages living here inside the fences. Most of them were management issues, including horses across a single fence fighting. I sure don’t do that anymore! Fencer got hit by lightning, didn’t know it was off, had horses trying to graze under the wire. Now I check fencer DAILY ti insure it is working. All the injuries healed up well, horses remained totally usable in hard work.
We have found high tensile fence to work well for us. Exceptions were a couple stupid horses who would NOT leave it alone despite getting badly shocked by the fencer. I thought the fencer wasn’t working and touched wire in the same place, got knocked down! They were resold ASAP, not the kind of brain we wanted to own!! I SURE don’t want to ride or drive a horse that does not learn fence will bite after several painful shocking lessons! That kind of horse will get you hurt or killed, no survival instinct! I don’t care about their looks, talent, how well we get along otherwise. Not leaving the fence alone is my “early warning” that horse is not going to work here.