by Pat Gray

Created on: December 20, 2011   Last Updated: December 25, 2011

When animals are in pain, they try to hide their discomfort - concealing illness or discomfort is a survival instinct that protects wild animals from predators, and is a strategy which many domestic animals have retained. Unfortunately for animal owners, this makes it very difficult to tell if the animal is just tired or if they require medical attention.

Note: The information provided here is not meant to replace veterinary care. If you are concerned about the health of your pet do consult a professional.

1) Behavior changes

Typically, the first sign that an animal is in pain is a change in normal behavior - a quiet animal may become vocal or a vocal animal may become quiet. A normally active pet may become less active, a very social pet may become anti-social. A lack of interest in favorite activities -  playing fetch or snuggling on the sofa - can also indicate that a animal is in pain.

One major behavioral change is a lack of appetite, even when tempted with favorite or special foods. If an animal, especially an animal with a normally healthy appetite refuses to eat a meal or two, it may be time for a trip to the vet. Dramatic weight gain or loss is also cause for concern.

2) Hiding

Cats in particular will hide under the bed or in the corner of a quiet closet when ill or in pain.

3) Glazed eyes

There is something in the eyes of an animal in pain - a far away look, dilated pupils, watery eyes, redness or a squinting, half-lidded look - may indicate an animal is in pain.

4) Aggression

Aggression, whether it's a long-standing problem or a new behavior, and especially when the animal reacts aggressively when touched in a particular spot, is a possible pain indicator.

5) "Withdrawal reflex"

Veterinarians use a reflex test to determine whether an animal is in pain - gently probing an area or, gently flexing a leg or manipulating the tail. This method is best left to experts however, as you can cause the animal more pain or may even make the injury worse, and an animal in a great deal of pain may react with a growl or even a bite.

6) Sleeping

An animal in pain may begin to sleep an unusual amount of time or in unusual circumstances - in the middle of a busy floor or even in the waiting room of the veterinarians office.

7) Excessive grooming

Cats groom naturally, and some dogs have this habit too, but excessive grooming, especially grooming a particular area until there are visible signs of injury is a sign of illness or pain.

8) Vocalizing

When jumping off the sofa or

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