Skin tumors are the most commonly seen tumor in dogs, reports the Merck Veterinary Manual. By regularly examining your dog's skin, you can take a lead role in caring for their health. Establish a weekly routine of inspecting your dog from the tip of their nose to the end of their tail. Make sure to hone in on commonly overlooked spots, like between the toes, under the tail and even in your dog's mouth — if they're cooperative. Chances are your pooch will enjoy these extra pets and rubs.

If you find a mass on your dog, make sure to note where it is, and not just mentally. Grab your phone to snap a quick photo or two. A dog's lumps and bumps can change over time, and keeping a log of their locations and sizes will help your vet more effectively manage your dog's health.
Diagnosing a Lump on My Dog
"What should I do if I find a lump on my dog?" It's a common question pet parents ask. The best thing you can do if you discover a bump on your dog is to schedule an appointment with the vet. While Dr. Google provides a wealth of pet health information, it's easy to go down a rabbit hole of misinformation and panic. Instead, go straight to the expert. Even if your dog is due for an exam in a few months, don't wait. Even noncancerous masses can worsen and get infected if you wait too long to bring your dog in for treatment.

Your vet will need to take some tests to accurately diagnose your dog's lump. They may recommend a fine needle aspirate and cytology — one of the least invasive procedures to evaluate a lump or bump, during which a vet uses a small needle to collect cells. The cells are placed on glass slides and stained for microscopic review. Depending on the type of mass, the vet may be able to diagnose it quickly. Or, your vet may send out the slides to a laboratory to have them reviewed by a specialist.