a sus perros

his dogs / their dogs

→ a
phrase Rare #39,158
his dogs / their dogs In these examples, a is the personal a used before a direct object that is a person or pet.
SP: Siempre saco a sus perros por la mañana.
EN: I always walk their dogs in the morning.

Hay una teoría que dice que los dueños usualmente se parecen a sus perros.

There's a theory that owners usually resemble their dogs.

Incluso, salen juntos a pasear a sus perros.

They even go out for walks with their dogs together.

— Kal Ho Naa Ho (2003)

Miraron a sus perros.

They looked at their dogs.

Pavlov tocaba una campana cada vez que alimentaba a sus perros.

Pavlov rang a bell every time he fed his dogs.

Llamen a sus perros.

Call your dogs.

Sami no le pide nunca a Layla que saque a sus perros a pasear.

Sami never asks Layla to take her dogs for a walk.