Agreed.I agree with JudyG. The family needs to know that their cat has died. It's not fair to them to let the family continue to search and worry about their pet. The whole "bury the cat and pretend that nothing happened" slant of this thread concerns me.
I don't think that Mark was at all irrational for being upset that the dog was off leash in the unfenced front yard. I'm not willing to bet that the dog's recall was 100%. With its high prey drive, Boomer could have easily run off in pursuit of the neighbor's cat that day.
Brushing off the neighbor's concerns does not make one a good ambassador for the breed.