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www.reference.com/article/causes-tumors-dog-15c8fc0c6efb59b3

Some of the causes of tumors in a dog include old age, poor oral care and breed of the dog, explains WebMD. Dogs that have not been spayed also have a higher instance of mammary gland tumors.

www.reference.com/pets-animals/10-aggressive-dogs-16059228a1ffff43

According to a Forbes article that rates dog breeds as potential insurance risks for homeowners, the 10 most aggressive breeds of dogs are Pit Bulls, Staffordshire Terriers, Doberman Pinschers, Rottweilers, German Shepherds, Chows, Great Danes, Presa Canarios, Akitas and Alaskan Malamutes. Though li

www.reference.com/article/can-tumors-dog-treated-d7b3d6f4e4124ae3

Dog tumors can be treated, and the type of treatment largely depends on the type of tumor. There are three common types of tumors that affect dogs: fatty skin tumors also known as lipomas, benign (noncancerous) tumors and malignant tumors.

www.reference.com/article/causes-tumors-493227802420d301

Benign tumors are the result of abnormal cell growth that can be caused by factors such as radiation exposure, genetic mutations, infections, stress and trauma, explains WebMD. Cancerous tumors are caused by a traveling cancer cell in the body that damages tissues and begins dividing, notes Medical

www.reference.com/article/publishes-dog-tumor-images-3cad47e80d0fe65c

As of 2015, images of various types of tumors in dogs are available on the veterinary medicine section of About.com. The Long Beach Animal Hospital website devotes a page to images and information on mast cell tumors in dogs.

www.reference.com/pets-animals/aggressive-dog-breeds-e9793c3495af9b0a

Although pit bulls, German shepherds, chow chows, Rottweilers and dobermans frequently are considered the most aggressive breeds of dogs, any dog of any breed can be aggressive. Research shows that training and socialization is more important than breed in predicting aggression, reports the Smithson

www.reference.com/article/characteristics-aggressive-dogs-f149768c48c1429c

Aggressive dogs exhibit a few tell-tale signs of defensive behavior, such as growling, snarling, staring, an immobile stance, holding a tail up or down and snapping. A dog displays these characteristics when it feels provoked, threatened or cornered.

www.reference.com/article/cancerous-tumor-called-3508b29f082ab58

A malignant tumour is a cancerous tumour, and it contains cells that have the ability to spread and invade surrounding tissues and organs. This type of tumour can cause damage that is potentially fatal.

www.reference.com/article/brain-tumor-bc8d0c82724f98ae

A brain tumor is tissue mass that is formed by abnormal cells, defines WebMD. Tumors do not die like normal cells do. Brain tumors can be both noncancerous or malignant. Cancerous brain tumors grow faster than noncancerous ones, and they attack surrounding tissue.

www.reference.com/article/symptoms-brain-tumor-e32404638af4a725

Symptoms of a brain tumor include unexplained nausea or vomiting, changes in behavior or personality, headaches that gradually increase in frequency and severity, and new onset or change in pattern of headaches, according to Mayo Clinic. Brain tumors may also cause vision problems such as double vis