Which preposition to use with perro

at Occurrences 1%

Perro at Marcos' feet, stirred uneasily and looked up into his master's face.

en Occurrences 1%

no que éste ha bajado las escaleras á trompicones, como si le ladrase un perro en la meseta, y con un color de difunto y unas... Vamos, mi señora doña Baltasara, créame usarced, y créame con todas veras...

from Occurrences 1%

" She forcibly ejected Perro from the room, and came back breathless and laughing.

with Occurrences 1%

" "And dear old Perro running at the side," exclaimed Juanita, jumping up and putting her head out of the window to encourage Perro with a greeting.

Which preposition to use with  perro