Remember, you not only have to remove the popcorn texture, but also redo the ceiling in some other texture. 1) how much the contractor you choose hates removing popcorn or textured ceilings - some charge $1 or so/SF extra just because they hate it.
Bananas are fine for dogs to eat. Dogs are omnivores, and most fruits are safe for dogs to eat (except grapes). Bananas are a good source for vitamin K, potassium, and other vitamins and minerals. Large quantities may cause stool problems however and is not recommended.
Believe it or not, this is a normal behavior for dogs that is just really disgusting to us. There are different reasons a dog might eat poop (Coprophagia is the clinical term) and it is important to find out why they are eating it before you can find a solution. A lot of dogs will eat poop because they are bored - it will become a toy, another source of play.