The man is throwing a toy to a brown and black dog in the park.
A man and a dog are sitting on the couch.
A man is throwing a toy to a dog in a park or he and his dog are sitting on the couch and cannot do both simultaneously.
Throwing a toy and sitting are different activities. The couch and a park are different locations.
The man and dog can either be at the park or sitting on a couch but not both