The dog is invincible and can one punch even 10th rank expert. Don't wanna write detailed spoiler but the story is generally like this So first half is just some repetition of some morons and supreme beasts want to destroy his shop because of reasons and get rekt instead and we watch dumbfounded crowd's reactions. Then later half until current latest raw is mc opening a branch in another country but in this region restaurants are bankrupt because people prefer eating pills from alchemist instead of food. He participated in some kind of competition against alchemists with his food and then it's all the same thing repeated again
Probably not, the dog can kill rank 10 easily meant that there are experts and monsters stronger than that Oh it was said that the kingdom is in weakest part of the continent