My dog is nearly 13 years old and has been going off her dry food recently. I've always tried to jazz it up by adding scraps of meat or gravy but even that isn't tempting her lately. She had a full check up at the vets this week and she's lost 4kg over the last two years (she's a lab cross). He's concerned about the weight loss but couldn't find anything wrong. I've cooked her some chicken and brown rice a couple of times this week which she's eaten with enthusiasm, so it looks like I'm going to have to cook for her! The only trouble is I'm not sure what to cook or how much she should have? I know there are various foods dogs shouldn't eat but what is good for them to have (that doesn't require loads of preparation). Also, should I vary it much or is that likely to upset her system?