I never caught this.
The name of St. Patrick’s owner (who was a druid of rank) was named Mil-chu. And a mil-chu (large + greyhound, hound) was an Irish wolfhound.
And when Patrick was out herding sheep and guarding them from wolves, his friend was a mil-chu.
And when he caught a ride with pirates and got shipwrecked back in Roman territory (either in Gaul or Britain), his job was taking care of the mil-chu cargo.
One of St. Patrick’s converts and supporters, who granted him land in Down, was named Di-chu.
St. Patrick, pray for us!