The promotional material on the No More Woof site makes it all sound so easy--dogs are simple creatures, so it should be easy to figure out what they want. But Packer higlights a few more issues. EEGs aren't good at looking in-depth into the brain, where mechanisms like hunger would be detected. The spot where you'd pinpoint hunger, for example, is located deep in the hypothalamus, and EEGs are used to pick up measurements that are closer to the brain's surface, like epileptic activity, Packer says. (But even seizures, which you'd think would be simple to detect, are complicated.) To really do this, you'd need a wearable fMRI or PET scan device--which don't exist. And it's even harder to get accurate readings in dogs than it is in people; dogs have thick muscles in the skull that create interference. Even using needle-based electrodes, which can go deeper, it's extremely hard to get an accurate reading. She also points out that electrical interference causes issues in readings, and trying to read your dog's mind while it's running through a home stuffed with gadgets is problematic, to say the least.