As a family, we have lost 5 dogs, 1 horse and l cat to different types of cancer. Lymphoma reared itself as a lump on a galgo’s neck, which had spread. A sarcoma started bleeding under my horse’s tail. Cancer developed in my cat’s mouth. 2 more galgos had stomach tumours.
Weblink to an interesting article on lumps on your dog. It doesn’t always mean cancer.