He was havingconvulsionsandfoamingat themouth.
Theyfoundher on theground,foamingat themouth.
Somerabidanimalswillfoamat themouth, but most do not.
Theanimalswere in aterriblestate,lyingintheirowndirtandfoamingat themouth.
Thedogwassnarlingandfoamingat themouth.