20/10/2025
HUMANE EDUCATION BLOG!
If you’ve ever felt a lump on your dog while cuddling or grooming, you might wonder what it could be. One common cause of lumps in female dogs is mammary tumors, which are growths that develop in the milk glands along your dog’s belly. These tumors are more common in dogs who haven’t been spayed or were spayed later in life, and some breeds like poodles, spaniels, and German shepherds seem to get them more often.
What to Look For
Most of the time, these lumps don’t cause any pain or obvious problems, so you might only notice them by touch. Sometimes, the lumps can get sore, bleed, or your dog might lick them a lot. If the tumor spreads, your dog might start losing weight, feel tired, or have trouble breathing.
How to Check Your Dog for Lumps: Simple Tips for Pet Owners
1. Choose a Calm Time: Pick a quiet moment when your dog is relaxed—like during petting, after a walk, or before bedtime.
2. Use Your Hands: Gently run your fingers over your dog’s body, feeling for any unusual bumps or lumps. Pay special attention to the belly, chest, armpits, groin, and along the mammary chains in female dogs.
3. Know What’s Normal: Some areas naturally have small bumps or thicker skin, so get familiar with your dog’s normal feel. Lumps that are hard, irregular, or fixed in place are worth noting.
4. Check Both Sides: Dogs have symmetrical bodies, so compare the left and right sides for any differences.
5. Keep a Record: If you find a lump, write down its size, location, and whether it feels soft or hard. Take a photo if possible to track any changes over time.
6. Don’t Panic: Many lumps are harmless, but it’s always best to have your vet check any new or changing lumps.
Preparing for a Vet Visit When You Find a Lump
1. Make an Appointment Promptly: Call your vet as soon as you notice a lump to schedule an exam.
2. Bring Your Notes: Share your observations about the lump’s size, location, and any changes you’ve noticed.
3. List Other Symptoms: Mention if your dog has any other signs like loss of appetite, weight loss, or changes in behavior.
4. Prepare Your Dog: Bring your dog’s favorite treats and a leash or carrier to keep them calm and comfortable.
5. Ask Questions: Don’t hesitate to ask your vet about the lump, possible tests, treatment options, and what to expect next.
6. Follow Vet Instructions: Your vet may recommend tests like biopsies or imaging. Follow their guidance closely to help your dog get the best care.
How Vets Check for Mammary Tumors
Your vet will do a thorough check-up and might take a small sample from the lump to figure out if it’s harmless or something more serious. They may also do blood tests and take pictures of the chest and belly to see if the tumor has spread.
Treatment Options
• Surgery is usually the best way to remove the tumor. If your dog isn’t spayed yet, your vet might recommend spaying at the same time, which can help prevent new tumors.
• Radiation and chemotherapy might be options if the tumor is more aggressive or has spread, but not every dog needs these treatments.
• Some dogs also benefit from medications that help slow down tumor growth.
What’s the Outlook?
If the tumor is benign (not cancer), your dog will likely be just fine after surgery. Even some cancerous tumors can be treated successfully, especially if caught early. That’s why it’s so important to check your dog regularly and see the vet if you find anything unusual.
Taking Care of Your Dog During Treatment
Treatments can have side effects like tiredness or upset stomach, but your vet will help you manage these so your dog stays comfortable. Surgery risks are low, but it’s normal to worry — your vet will guide you through every step.
Remember, finding a lump doesn’t always mean the worst. Early check-ups and treatment can make a big difference in your dog’s health and happiness. If you ever notice a lump or any changes, don’t hesitate to reach out to your vet. And always remember, the treatment plan that you choose is the one that is right for you and your pet. Talk it over with your Vet and decide what is right for your situation.
Nicole Laber, Cofounder and Fospice Mom
