Leo really doesn't like being stroked while he's eating! If you stroke or fuss him while he's eating he'll pull these faces and make a variety of snarly/growly/whiney noises. Won't even attempt to bite you, mind, but he'll just stand there with his teeth bared, hackles up, ears flat and make his point known that he's not best pleased.

It's really strange. You can put your hand in his food bowl when he's eating - he's fine. You can take the food away from him - he's fine. You can be right next to him, crouched down and staring at him - he's fine. But if you stroke him while he's eating he doesn't like it.

Grumpy mutt!