Sentence:  In addition , it would be difficult to imagine chronic generalized emphysema occurring in a cow , considering its marked lobular development but , conversely , not difficult to imagine this occurring in the horse or the <WSD>dog</WSD> . 
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