The risk of developing cancer increases with age. This means that, as cats now enjoy a longer life expectancy through improved veterinary care, the number of animals with cancer has been increasing in recent years. In cats some viral infections may increase the risk of affected cats developing certain types of cancer. In some cats malignant tumours develop at the site of injections, which are most commonly given under the skin on the back of the neck. If you notice any swelling in this area make sure you contact your vet immediately.
The signs of cancer are very variable and depend on the type of tissue cells involved, the site of the cancer and the stage of the disease. Animals with advanced cancers often show weight loss and loss of appetite. If your cat has cancer it may be depressed, vomit, have diarrhoea or constipation or fever. Your pet may also get tired easily because of other effects caused by the cancer, eg anaemia.
The survival chances will depend not only on the type and stage of the disease but also on your pet's general state of health. You should discuss this issue with your own vet so that you can agree between you an appropriate treatment plan for your cat. It is understandable that, faced with a diagnosis of cancer, you will feel frightened about the future for your pet. Discussing your fears with your vet is the very best way to obtain reassurance and an independent assessment that you are doing what is right for your pet.