Through barking and the sense of smell.
They lick each other. === ===
Dogs typically show affection towards each other by licking each other's faces. This behavior is a sign of social bonding and can also be a way for dogs to groom one another. It is considered a natural behavior for dogs to kiss each other in this way.
Dogs say "hello" to other dogs by sniffing each other's rear ends.
yes cause my dogs did
This is something that comes by instinct to dogs. They are trying to dominate each other and no, that's not bad. They are not hurting each other they are just play - fighting. My 2 dogs do this all the time.
they take care of each other like wolf packs take care of each other
of course
Dogs may sit on each other's head as a way to establish dominance or to show affection. It is a common behavior in social hierarchies among dogs.
to see if they jnow each other
You will know your dogs are getting too rough with each other when they start growling and lunging in an aggressive manner.
No, dogs and cats cannot mate with each other because they are different species with different numbers of chromosomes.
As friends, yes. Sometimes they do each other but its not very common..