What does a tumor feel like in a dog?

It depends on the tumor. Some are soft and squishy and round like a lipoma. You'll find those in Labrador Retrievers under the skin many times. Some of them are very firm and hard tumors in the skin. You'll see that in certain sarcomas. With bone tumors, you'll see very painful swelling. It just depends, but for the most part, most owners are finding lumps and bumps on the dog, and that's what brings them to me.