The question of whether you can connect the ECHO Dot to the Alexa Dot 5 is a little confusing, as there is no "Alexa Dot 5". However, if you want to know if the ECHO Dot can be connected to other Alexa devices, the answer is yes. Amazon Echo devices, including the ECHO Dot, can be connected and controlled via the Alexa app. They can work together in a smart home system to enable functions such as music playback, smart home control and more.