Another issue is the possibility of an allergy to proteins in the saliva of pets , such as Fel d 1 in cat allergy and Can f 1 in dog allergy .
DET NOUN AUX DET NOUN ADP DET NOUN ADP NOUN ADP DET NOUN ADP NOUN , ADJ ADP PROPN PROPN NUM ADP NOUN NOUN CCONJ AUX X NUM ADP NOUN NOUN .