My dog has a huge black hairy mass on his paw. What could it be?

Thank you for submitting your question regarding Max. I recommend that he sees his veterinarian for a procedure known as a fine needle aspirate. The veterinarian will collect a sample of cells and evaluate them under the microscope to diagnose the mass. A histiocytoma is a common benign growth on the extremities of young dogs. Unfortunately, a mast cell tumor is an aggressive cancerous growth that has the same outward appearance. This is why the cells need to be examined. I hope this information helps!

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. There is no way of knowing what it is just based on its appearance. Common tumors in this region include melanomas, squamous cell carcinomas, mast cell tumors and soft tissue sarcomas, among others. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have him evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good night!

The bump you are seeing could be a mass, or it could be a skin lesion caused by bacterial, parasitic or fungal infection, dietary or environmental allergies or sensitivities, or could be a combination of the above. I recommend making an appointment to have your dog seen by your veterinarian to help determine the cause of the bump you’ve noticed and to make sure it is treated appropriately. The vet will likely want to look at a sample from the area under the microscope to determine what is causing the bump and to provide treatment. . In the meantime, if he is licking the area, I recommend putting an e-collar/cone on him to help prevent licking and reduce the risk of infection.

This is definitely a mass, however it is not possible to say whether it is benign or malign from a photo. Your vet will likely suggest the complete surgical removal of this mass. He may also suggest a biopsy or a fine needle aspirate (FNA) where some tissue of the mass is removed and then either sent in to a laboratory or examined under the microscope. This will help determine whether this is a malignant mass or a harmless one.

Thank you for submitting your question regarding Bruno. I recommend that he sees his veterinarian. He may need a procedure known as a fine needle aspirate to diagnose the mass. The veterinarian will use a small needle to collect a sample of cells to evaluate under the microscope. This will help to determine the type of mass and guide treatment. A histiocytoma is a common mass on the limb of a young dog. This is a benign growth. However, the outward appearance is the same as a cancerous growth known as a mast cell tumor. In the meantime, place an E-collar on him so that he does not cause any self-trauma. I hope this information helps!

Obviously I can't definitively determine the cause of Fabulous's skin lesions without examining him and taking a biopsy sample. However, looking at the pictures, some of the most likely causes of this type of lesion include papillomas, over production of keratin, or benign skin tags. It would be best to have this lesion examined by your vet. Some lesions that stick out can get caught on objects, causing the area to bleed and potentially become infected. I hope that everything goes well for Fabulous!

Ouch! With any new growth like this, it's best to have your vet take a look in person, as it isn't really possible to determine what is causing the growth just from a photo. Your vet can take a sample of the growth as needed with a fine-needle aspirate, or biopsy, to check what cell type is present and if the spot needs further attention. Other causes can be calluses from rubbing, scabbing from a wound or infection under the skin, or other issues. Until you can get to the vet, it's best to keep the area clean and dry and prevent Ginger from licking or chewing at it with an Elizabethan (cone) collar or sock over the spot. Monitoring it for any additional changes such as size, oozing debris, pain, etc, is also a good idea as these observations can help your vet narrow down the cause and best treatment plan.