Humans speak to dogs using a special speech register called Pet-Directed Speech (PDS) which is very similar to Infant-Directed Speech (IDS) used by parents when talking to young infants. Pet-directed speech draws adult dogs’ attention more efficiently than Adult-directed speech.

See the source article by following the link below:
Humans speak to dogs using a special speech register called Pet-Directed Speech (PDS) which is very similar to Infant-Directed Speech (IDS) used by parents when talking to young infants. Pet-directed speech draws adult dogs’ attention more efficiently than Adult-directed speech.