Because they were bred for hunting, they can exhibit some behaviors that are related to that. They were designed to dig into badger burrows, and that instinct may lead them to dig up your dahlias instead. They were bred to be tenacious in the hunt, and this instinct may lead them to be relentless in pestering you for a treat. They were bred to not only hunt but kill their prey; in your household, the "prey" most likely will be your Dachshund's toys and he will effectively "kill" them one after the other