1, malignant skin tumor.
Malignant skin tumors include mast cell tumor and melanoma. In healthy dogs, mast cells are actually part of the immune system and can cope with allergic reactions. Malignant melanoma usually grows around the dog's mouth or nails. If it grows on nails, it may make the dog's toes swollen and dull.
These two kinds of tumors mostly occur in old dogs, most of which are benign, but some of them will develop into malignant tumors, which need hospital examination before they can be distinguished.
2. Lymphoma.
Lymphoma accounts for 10%-20% of canine cancers. This malignant tumor affecting the lymphatic system is caused by gene mutation, and the number of mutant cells exceeds that of normal and healthy cells, and it is drug-resistant. Dogs with lymphoma are about 8 years old. The common dog breeds are Labrador, Golden Retriever, Bugs and Bulldog.
3. Spleen tumor.
Splenic cancer is more common in elderly dogs and large dogs. Tumors are classified into benign and malignant. However, generally speaking, spleen tumors are mostly benign, and the problems caused are not great. If the spleen tumor is found early, then the spleen can be removed by surgery.
4. Joint tumor.
The etiology of joint tumors is not particularly clear at present, but it seems that some dog breeds are more likely to get bone cancer. Persistent lameness seems to be the only sign of bone cancer.