1. Alpo is not good. Whatever you can find in the supermarket is not good.
2. BRands to avoid - Alpo, Pedigree, Eukanuba
3. There is a kibble thread in this section of the forum, go with popularity of the lot and you wont be mistaken.
4. Leftovers are... ? Usually, human food is cooked with oil, salt, sugar, perasa, etc - all this is harmful to your dogs. Too salty will cause fur loss, sugar leads to diabetes, dogs can hardly digest oil so they turn fat easily, etc. It's best if you avoid human food on dogs.
5. If you dogs dont eat, take it up and continue the next day. Teach it the meaning of HUNGRY so he wont be so demanding.