“迷你杜宾” means Dobermann Pinscher, a breed of dog you know. “小鹿犬” means Miniature Pinscher, another breed of dog, which you can google more relevant information online.
Since the literature is partly blocked, I could only translate the part I can see into English.
The first line: Strong enough, they tend to swagger......
The second line: This breed of dog used to be lesser-known......
The last line: Dobermann Pinscher and Miniature Pinscher are different, not the same breed of dog.
Hopefully this may help you.