A lab dog is standing on a fallen tree trunk with a guy in the background.
there is a guy carrying his pet with him near fallen tree
A guy cannot be carrying his dog if the dog is standing on a fallen tree trunk on the ground and he is in the background away from his pet.
If a pet is being carried, it would not be standing on a tree trunk at the same time.
A dog is an animal, the word guy means a male person.