My dog has a back lump that changed shape and bled. Should I worry?

Thanks for using Petco Pet Education Center, formerly Petcoach! I think you should have this checked. The fact that it was previously known to be benign, does not mean that now it cannot be malignant. If it has gotten bigger, it would be great to sample it again. I recommend you have Lily evaluated by your veterinarian for a test called fine needle aspirate which is an easy, quick and pain-free procedure which in the majority of cases will help reach a diagnosis to identify what the best course of action is based on the findings. In some cases, a biopsy is needed for a diagnosis. If it truly is benign then removal is not necessarily recommended. However, if it is malignant and it has not spread to other locations, then surgical removal is recommended. Good luck! Keeping my fingers crossed that it is something benign.

Please keep in mind that without seeing it in person or even a picture, I can't say if Luna has a wart or not. It certainly is possible that she does have a wart, but it could be another kind of benign tumor. I would have her seen by a vet for it. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of it's cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. If it is a wart, typically it doesn't need to be removed surgically unless it's bothering her. You can talk to the vet about if it needs to be removed or not. I hope this helps!

Any suspicious lumps should be examined by the vet. This lump on Ophelia could be caused by a wart, but it could also be due to a benign tumor or a malignant tumor. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of it's cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. I would have Ophelia seen by a vet on Monday or Tuesday to have this lump examined and diagnosed so it can be treated as needed.

Yes, this does look like it could be a benign growth but unfortunately I cannot make a definitive diagnosis from a picture. Any suspicious lumps should be examined by the vet. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of its cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. Once the cause of the lump is diagnosed, the vet can discuss treatment options if needed. Give Charley's vet a call in the morning to make her an appointment. I hope this helps!

This could just be a benign tumor, but without seeing Pluto in person, I can't say for certain. Any suspicious lumps should be examined by the vet. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of its cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. Once the cause of the lump is diagnosed, the vet can discuss treatment options if needed. Give his vet a call to make him an appointment.

Its still possible that the mass is benign but with the change in size and now the irritation, I would recommend to have it checked out. The doctor may recommend to aspirate it or may just want to remove it. Make sure to keep it clean and make sure that Jake is not able to scratch at it. I hope this helps!

This looks like it could be a growth and it's clearly bothering him if he's biting at it. Any suspicious lumps should be examined by the vet. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of its cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. Once the cause of the lump is diagnosed, the vet can discuss treatment options if needed. Give his vet a call to make him an appointment.