Why are you thinking about changing? Is it because the new pony is bigger? If you feel comfortable on your current pony and are totally happy with him, I wouldn't change, you might not get on with the new one as well as the old one and you may regret it.

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Jasper - 6 month old Bloodhound
Star - 9 year old 13.3hh fell pony gelding
Lola - 7 month old Staffie x