I have a 5 month old (3lbs) Yorkie girl and she eats a whole thing of Little Ceasar's in one sitting and then will pick at dry dog food throughout the day. I wouldn't worry about it. How old is your new addition?
As for Ceeby, I would put him and his food in a seperate area where your little one can't gobble it up on him and then if he doesn't want it, put his food up until he wants it.
You might have to start a feeding schedule and seperate them at feeding time because it sounds like your little one is gobbleing all the food up so that Ceeby won't get any.
Good luck
