Translation:He was talking and looking at his own dog.
"He spoke and watched his own dog" is also accepted. There is, however, a report in the system for "He spoke and watched AT his own dog" that came in at the same time as your comment, which may have been your complete answer. "Watched AT" doesn't work in English -- it should be either "looked at" or "watched."
You are missing a word in the English translation...should be "He was talking to and looking at his own dog."