Sentence:  Type 1 , is represented by the cow , sheep , and pig ; type 2 , , by the <WSD>dog</WSD> , cat , and monkey ; type 3 , , by the horse . 
Meaning of the word marked with <WSD> tags:  a member of the genus Canis (probably descended from the common wolf) that has been domesticated by man since prehistoric times; occurs in many breeds