Hair, Whiskers
Scared and angry cats hold their hair straight up to appear  bigger in the early stages of fear and aggression. Some  cats with the big fluffy tails just puff them out.  

Whiskers have a broader expressive emotion. If a cat is  curious or angry, he holds his whiskers forward (cats also  do this in the dark to help them "feel" their way around).  They pull their whiskers backward when they are frightened.  

Most cats have 24 whiskers, divided on both sides of the  nose and arranged in four horizontal rows. The top rows  and bottom rows can move independently of each other and  each whisker. Even though whiskers are important to cats-  your pet may become disoriented if they're removed, which  is why you should never cut them.  

Posture:  

The way a cat holds her body must be observed along with  signs from the tail, ears, eyes, voice, and fur (including  whiskers) to correctly find out what your cats emotional  state is. A cat who enjoys being petted from head to toe  often arches her back to maximize contact with your hand.  
in another situation an arched back may mean you shouldn't   even go near her cause you might get hurt.  

Here are three positions of a cat and what they mean:  

Inquisitive - The friendly and curious cat is relaxed,  moving forward comfortably with tail up. Ears are up, too,  and slightly pointed to the sides.  

Defensive - A cat who's just angry or scared arches her back   and puffs out her fur in the classic "Halloween cat" pose.  

Aggressive - A cat who's going to attack crouches low, his   back a little higher than his front, ready to put his   powerful hind legs to use in a leap forward. the fur over   his shoulders is up, as is the fur on his tail. This cat 
means business; back away and let him be!  

A cat in an aggressive or defensive posture, is best to be   left alone. Even if he's your cat, give him time to chill   out before you even attempt to approach him. He'll be fine   after a little while. Even cat's have temper tantrums. 
Have you ever considered involving your toddler in the responsibility of caring for your cat? A toddler can become engaged by "helping" a parent fill food and water dishes, grooming, or riding along when taking the pet to the veterinarian. Another task for the toddler is to give the cat a treat for good behavior when deemed appropriate by the parents.
"Cats are smarter than dogs. You can't get eight cats to pull a sled through snow."
- Jeff Valdez
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