Author Archives: John

Why does a dog or a cat have mammary gland tumor ( cancer)?

Posted on August 19, 2015 by John

There are two types of tumor : benign  and malignant. It is said benign when the tumor does not have ability to attack other tissues- Metastatic tumor- but  malignant  has this potential to make metastatic tumor to involve other organs.On … Continue reading →

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Why a dog or a cat shows seizure ( epilepsy or convulsion)?

Posted on August 13, 2015 by John

Seizure means rhythmic movement of a part of body or whole body.Convulsion is another name for seizure but in veterinary medicine most often epilepsy is used.Convulsion can be started from a part of body and then it can affect other … Continue reading →

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What is cardiac murmur in pets?

Posted on July 20, 2015 by John

To explain cardiac murmur it is necessary to familiar with activities of heart. Heart has two activities: 1- Electrical activity which leads to mechanical activity 2- Mechanical activity which produces heart sounds. Electrical activity can be showed as a wave … Continue reading →

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Why can’t a dog or a cat open it’s eye?

Posted on July 7, 2015 by John

Usually ocular pain causes closed eye.This problem can be involved one or both eyes.There are so many problems but most usual are: 1- Conjunctivitis : inflammation of the conjunctiva. Conjunctiva is the internal sensitive layer of eyelids. Any viral or … Continue reading →

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Why is a dog or a cat so tired?

Posted on June 20, 2015 by John

When the body’s metabolism has a problem , producing of enough energy is decreased which leads to exhaustion. Metabolism is a complicated mechanism in cells   leads to provide enough ATP ( source of energy ) and maintenance of tissues. For … Continue reading →

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Reasons for dogs or cats’ limping ( Lameness) ?

Posted on June 1, 2015 by John

Definition: Atrophy is a pathological term which means becoming smaller than normal. Forelimb : front leg Hindlimb: Back Leg There are five major reasons for lameness in animals: 1- Nerve involvement: Fore and hindlimbs  have special nerves which innervate ( … Continue reading →

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Eyelid mass in dogs and cats

Posted on May 20, 2015 by John

Mass means accumulation of cells. Theses cells can be malignant (bad) or benign(good).Almost one third of  eyelid masses is benign but sometimes it is malignant like melanoma.An eyelid mass can be situated on the edge of the eyelid or near it, … Continue reading →

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Why my dog scratches itself?

Posted on May 13, 2015 by John

Inflammatory mediators like histamine cause cutaneous nerve stimulation which leads to pruritus sensation and scratch.Affected areas show erythema ( redness ) or rashes.In chronic patients alopecia and darkness of the skin can be seen. Common Causes: Most often pruritus in … Continue reading →

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Hair losing ( Alopecia ) in dogs and cats

Posted on May 7, 2015 by John

This phenomenon can be local or general, temporary or permanently. Alopecia is a scientific term which is used in veterinary science for hair losing.Sometimes alopecia  is occurred with changing color of the skin.Hyperpigmentation  is used when  the color of the … Continue reading →

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Heartworm disease in dogs

Posted on April 14, 2015 by John

As the name shows this illness is produced by a parasite which lives in the heart  or major vessels of dogs .A study on “Heartworm in dogs in Canada in 2010” published by the Ontario Veterinary College’s Department of Pathobiology … Continue reading →

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