How bad is it? It's from the how-sick-can-we-be school of film making.
Should you see it? No.
A group of children are led through a journey of the mind and through other dimensions by a talking dog. It's depraved, it's sick, it's surreal and it's in very bad CGI. There's rape, pedophilia, murder and some stuff too gruesome to discuss -well, okay, a baby gets ripped out of its mother, the dog rapes the woman and the baby gets stuffed into a child's butt... and so on.