Thank you all for your experience and ideas on this. From what you've said, there is hope then! I'll just keep things steady and wait for eventual improvement .
My six year old gelding has been "home alone" for the past few months, has always been a happy sociable -with -people and horses sort of pony; then three weeks ago my daughters new pony, a quiet non-aggressive mare, arrived-since when my geldings personality has completely changed. He is...