It's good to hear you are researching your Irish ancestry. When you say Casal Dowra, might you perhaps be referring to the village of Dowra in County Cavan?
Would you happen to know what year, approximately, Michael McHugh was born or married?
In 1864 civil registration was introduced in Ireland, which is when we started seeing the formal registration of births, marriages, adoptions, and deaths. These records
have been kept at the General Register Office of Ireland (GRO), through the Irish Genealogy website, to this day.
Before 1864 records were kept in the form of church and parish records, all the surviving records have been sorted into county-based genealogical centres. This page here
is useful for people looking to search records from County Cavan, which may be where Michael McHugh was from.
There is an existing community post
on 3 steps to tracing Irish ancestors that may be worth a look at. There are some great resources and tips to be found there too.