Skips breakfast?

Is there any reason why a dog wouldn't want breakfast?

Fred has stopped eating breakfast. Eats all his tea up just fine, nothing is left. But in the morning he picks at it, and leaves most of it.

Cali hasn't eaten breakfast since she was a puppy, she usually won't bother eating until maybe 7 or 8 o'clock.

Aura does exactly the same! The other dogs usually finish breakfast fine but she'll pick at it until I lift it up. If I offer her it again in the afternoon shell eat it and she always finishes her dinner but never breakfast unless she hadn't been given dinner the night before for whatever reason.

Lucy's a bit like that, I think some dogs just prefer one meal.