Here's an interesting one for you , tying to get my dog to eat in the morning can be difficult - sometimes she will go all day without touching her food. I read an article about giving them canned fish - so I've given it a go , miracle! She cant eat it fast enough.
Be careful though , a lot of canned fish is kept in either tomato sauce or brine - high in salt. Ive managed to find Mackerel at Waitrose, in spring water , perfect! She loves it.