There are four different methods or ways through which an animal communicates including tactile, visual, chemical, and auditory. A few animals depend on more one form of communication rather than others. These methods are being used by animals to ward off threats, show affection, and/or attract towards a mate.
Chemical Communication: The term chemical communication is defined as a method through which an animal communicates with that of other animals or species. An animal often leaves scent to signify territory or attract a mate.
In the question above, the dog's behavior is an example of chemical communication.
Lincoln recognized that the Emancipation Proclamation would have to be followed by a constitutional amendment in order to guarantee the abolishment of slavery. The 13th amendment was passed at the end of the Civil War before the Southern states had been restored to the Union and should have easily passed the Congress.
It is a mountain range stretching 1500 miles approaching the boundary connecting India and Tibet; the range includes the world's tallest or highest peak.
Zodiacs constellations are the specific 12 constellations which are passed by the sun once a year. Zodiac constellations are the constellations which give the zodiac signs to people.