dog rose vs sweetbrier

dog rose

noun
  • The European wild rose, Rosa canina, having fragrant white or pink flowers and stems with sharp spines. 

  • A Rosa canina flower. 

sweetbrier

noun
  • A Eurasian rose, Rosa eglanteria, having prickly stems, fragrant leaves, pink flowers and red hips 

How often have the words dog rose and sweetbrier occurred in a corpus of books? (source: Google Ngram Viewer )