Available choices:
(1). Take your dog to the vet for several days. The vet will discuss treatment options with you and schedule a consultation.;
(2). Lumps on the skin can disrupt your dog's immune system, preventing it from eating healthy meat properly and inappropriately. Detect any reddish red bumps on the dog's skin.;
(3). Watch for unexplained weight loss. Another common symptom of canine cancer is weight loss.;
(4). Take a look at the dog's eyes. Those classic beagle dog eyes are usually red, swollen, and inflamed.;Choose from options above and answer: What most naturally follows?

How to diagnose canine cancer 
Look for lumps on the skin. 
The most important thing you can do is to be alert for changes in your dog. This includes paying attention to lumps, like watching for the growth of a new lump on the skin, the enlargement of an existing lump, and a change from a lump not bothering the dog to becoming angry-looking or itchy.
Answer:
(3).