Charlie loved the dog more than his kids...
There are several clues that show how what charlie is the most stressed and sad about is the poodle, not his kids--
the dogs name is spider and spiderman is adam sandlers favorite movie.
he lets his hair grow out for this movie to look like a poodle.
poodles look like rain clouds and fits with the "rain over me" theme.
you can see milk bones that he saved in his kitchen, but he doesnt even want his daughters lamp.
He didnt like his kids, just his dog. He is mad at his kids for bringing the dog on the trip instead of leaving the dog with him--its so obvious.
"Momma told me not to come."