Hello! I guess you can use a pair of comma. The Great Dane , which is my favorite dog breed, originated in Germany.
Step-by-step explanation:
Thats because comma is used to add non-essential info to a text or in other words , if i remove it the sentence will make complete sense usually it is with words such as : which, who , apparently etc... I guess dash can also be used but it is more suitable to use comma i believe .