3 year old Ceaser won't eat! Help!

Hello:
We have a 3 year old staffie boy called ceaser! He's good as gold. Recently my boyfriend bought me a puppy (bitch- Luna) and they adore each other! Always playing and stuff but our boys appetites gone straight out the window, he used to have two meals a day but when you put his breakfast down he turns his nose up at it and will eat it for dinner instead I'm just wondering if anyone has has experience with this and if you could give me so e advice really worried about my baby boy z

Thanks in advance x

Could be due to the fact you have brought a new puppy into the house and the dogs unsettled. Have ypu tried walking them both together and feeding at the same time . It may take a long time for caesar to settle.

Yeah we've walked them together fed them together and he still won't eat ."x

Have there been any signs of the dog being unwell unusual behaviour? How long has caesar not been eating for? And is he drinking?

Is he still drinking? Could be an adjustment thing if he is but if not a trip to the vet should be considered