We have a seven year old Rocky Mountain and he can be pretty jumpy and spooky too. He always likes to stay at the other end of the pasture when he is getting caught. He has been even more jumpy since he saw a "raging monster" (a cow) and hopped the fence. Hehe he is okay. You know how scary they can be!
If he keeps running away from you when you catch him, obviously he want to run - so make him run until he doesn't want to run anymore. Once he settles down a bit or every time he stops, slowly walk toward him - eyes away, shoulders down and don't walk in a straight line towards him. Walk to the sie a bit then kick something and look around. You want him to know that you are a friend, not wanting to hurt or scare him.
Once he is caught, bring him outside and let him eat for a little bit as a reward for being caught. Then bring him to where you will ride and groom him, as another reward to him.
🔫 Don't Tread On Me 🐍