"It's a Dog's Life" is an enjoyable but bad episode of "Murder, She Wrote". In fact, up until this episode, the shows were very good...but this one, logically, just isn't particularly effective. So why is it STILL enjoyable? Well, it's awfully funny.
The story is set at an estate where a rich old guy and all his rich friends are going on a fox hunt. However, during the hunt, the old man's horse goes nuts and ends up killing him.
Later, the family gathers for the reading of the will and it's soon obvious they are a terrible lot. Apparently, however, the old guy knew this and left a videotaped will...in which he gives them almost none of his $15,000,000 estate. Instead, his beloved dog Teddy is the recipient! However, WHO killed the old man? And, soon one of the family members dies...and you wonder who the murderer might be. Of course, Jessica Fletcher just happens to be there and she is able to sort through the tangled web of lies and clues.
The two murders are VERY complicated and the first one, in particular, is very imprecise and easily could have led to no death at all. As for the second killing, well it's ridiculously improbable. What also makes it a bad episode (relative to the prior ones) is the one daughter...the one interested in astrology and all things 'flaky'. She is VERY broadly written...too broadly written to be realistic. Instead of introducing her weirdness in a subtle manner, EVERYTHING she says is goofy...and seems like a caricature instead of a character.
As for the humor...well there is a lot to make you laugh (such as seeing the dog in jail!)...perhaps enough that you won't notice all the logical errors.