1. Tumors(neoplasm )
Cellular disease in which new raw of cells develops to form abnormal mass of tissue grows without any control , serve no useful function and transmitted its capability to their progeny, and depending on the behavior can be classify into Benign and Malignant tumor.

2. Benign tumor
It is usually grow slowly , are encapsulated , and don’t invade surrounding tissue , it may be hard pedundulated or nodular, surgically easy to remove and don’t recurrent.

3. Malignant tumor
It is usually grow rapidly , are not encapsulated , may be locally invasion, have an increased blood supply , may be ulcerated and infected , infiltrative, metastasis after surgical removal.

4. Symptoms
Benign tumor: remain localized , they resemble the patient tissue in their structure, they grow slowly , may be simple or multiple, usually encapsulated and freely movable in the tissue ( under the skin ) didn’t invade the lymph vessels and lymph node. The benign tumor are harmless but may cause serious results due to their position ( e.g. benign tumor pressing over the brain tissue ). Or due to the position or the weight e.g. big tumor –like papilloma may cause stenosis or obstruction of an esophagus or even completely fill the bladder.

5. Symptoms
Malignant tumor: grow rapidly and infiltrate the tissue , histologically cannot determine the exact boundary of the tumor, metastasis by blood or lymph stream, involved of the regional lymph node (which its very important in prognosis ).

6. Symptoms
Malignant tumor produce their harmful effect leading to death due to several factors such as (toxin production, primary localization in an important organ , secondary pyogenic infection, metastasis into the vital organs, chronic hemorrhage –lead to anemia.

7. Diagnosis
1-the symptom . 2-clinicaly its important to know whether the tumor is malignant or not for determination of type of treatment and prognosis.

8. Diagnosis
A definite diagnosis can only be made by: A-biopsy and histological examination

9. Diagnosis
B-radiography –which help in determination of the lesion and helpful in determination of metastasis of the tumor to the internal organ. C-sex incidence –and involvement of sex organ . D-age incidence-old animal are susceptible .

10. Prognosis
Benign tumor are harmless except when it found or interfere with the function of the organ and if successfully removed they don’t recur.

11. Treatment
1-pedundulated tumors can be removed by applying a ligature of rubber or silk to their base –the circulation to the tumor is arrested and necrosis of the skin at its base taken place. A ligature can even be used for sessile tumor. The wound caused by the ligature must be dressed with antiseptic application, or by red hot iron –these have the advantage of cutting and arrested hemorrhage. 2-the use of caustics –e.g. arsenic paste , salicylic acid. 3-Surgical excision.

12. In case of malignant
1- The use of caustic –such as repeated application of Aqueous alcoholic arsenics solution. 2-Radiotherapy –radioactive substance 3-Chemotherapy,– and X-ray. 4-Excision –complete removal , with the regional lymph node. 5-Amputation of the affected part. If this is applicable as in case of a limb, tail. 6-Euthanasia of the animal –to relief of the pain and the suffering.