This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Dip (Catalan)
In Catalan myth, Dip is an evil, black Hellhound and emissary of the Devil, who sucks people's blood. Like other figures associated with demons in Catalan myth, he is lame in one leg. Dip is pictured on the escutcheon of Pratdip. The legend is very old. Images of these vampire dogs already appear on the altarpiece of Santa Marina de Pratdip, from 1602. They also appear in another altarpiece from 1730, cut out on a gold background.
Legend has it that these dogs sucked the blood of cattle, but only went out at night, and among their victims were drunken night owls who went to drink wine in the village taverns. It was said that evil eyes could be seen in the shadows of the night. It is believed that this legend was intended to frighten the drunkards of the village and thus prevent them from engaging in more drinking.