Bodoney is 2 parishes, Upper & Lower. I searched the tithe applotment records (which should list most farmers) for the years 1825 & 1830 but did not find anyone named Arnold.
I also searched Griffiths Valuation (1860) but there were no Arnold households listed in either parish then. There were 18 Arnold households in the county but none in those 2 parishes.
You haven’t said what denomination your family was but looking at the 1901 census for the county the majority of Arnolds then were Presbyterian, with some Church of Ireland, some Baptists and 1 RC family.
You could try searching for family baptisms. For Bodoney Lower only the Church of Ireland has records for part of the period you need. Their records start in 1812.
In Bodoney Upper, most of the early Church of Ireland baptism records were destroyed in the 1922 fire in Dublin. They have baptisms for 1806 – 1810 only. Glenelly Presbyterian church has baptisms from 1836 but otherwise no other denomination has any records for the years you are interested in. Copies of the surviving records I have mentioned are held in PRONI (the public record office) in Belfast. They are not on-line there and so a personal visit is required to view them.