Depressing and bizarre
In the first 15 minutes we are reminded of growing old, death, and losing the ones we love. For the rest of the movie we have a house floating on balloons travelling to South America, and talking dogs that fly airplanes, including one who wants someone to be his master and prisoner at the same time.
I'm not saying I didn't enjoy the movie, it's just those are the two words that most echo my feelings about it.