I was standing on my deck, lol, and those fence posts are 3.5 feet, but that is inside out 8 foot boundary fence. Outside its 4.5. As long as we leave the gates around our property up, there is no (feasible) way for horses to get out unless they went over the slippery, narrow, terrifying bridge with no guardrails- not that we rely on these barriers for keeping horses in of course!
I need to reinforce some corners with t-posts where we have the big posts so I will bring up them up from down below and replace the shorter ones in a pasture with the bigger ones.
“Good things come to those who wait… greater things come to those who get off their ass and do anything to make it happen.” - Unknown