My dog's growing chest lump fell off and is bleeding. What to do?

That growth may be a tumor or a cyst that ruptured. It is infected and has a very large open spot. the only thing you can do at home is keep the area clean and get an e collar from a pet store to prevent him from licking it and making it worse. It will need to be seen by a vet for antibiotics and possibly surgery to have it removed or this may be a repetitive cycle

Unfortunately this sounds like a mammary gland tumor. you cannot do anything at home i'm afraid as this condition needs ti be dealt with surgically, the only effective solution is a surgery to have this tumor removed.

It is very hard to say what the lump is without examining your dog and possibly taking a sample of the lump for pathology. It is possible that the lump is a mammary gland tumour (benign or malignant) but it really does not often happen in such young dogs. All you need to do at the moment is to keep the wound clean and make sure that Aubrey does not lick it. Once your vet is open, you need to take your dog for an appointment.

Unfortunately, even in person I would be hard pressed to give you a diagnosis based only on appearance. When a client comes in with a pet that has an unknown mass, we typically consider the following as possibilities, taking many factors into account: a mass/tumor, an abscess, a cystic structure, an insect bite, an allergic reaction, or a bruise from trauma. If the structure has burst open, it is most likely not allergic or from an insect. Depending upon your dog's age, the time the lump has existed, the consistency of the fluid you have noted, and the presence / absence of any other clinical signs, one of the other options is most likely. Something the vet might be able to do is obtain some cellular material from the affected area, place it under a microscope, and see if there is any cellular material that is useful in obtaining a diagnosis. Other times, appearance alone can at least tell a vet whether or not there is an active infection. As far as the possibility of cancer, tumors are certainly able to open up as you have described. They are typically more common in elderly dogs, though even this is largely dependent on the type of tumor. I would schedule a visit with your vet sometime soon. I would also in the meantime prevent Pancakes from bothering with the area. You can either buy an e-collar from a store / vet, or try and make something homemade until a commercial one can be obtained (with it being Easter, finding a store open that has one may prove difficult). The purpose of this is to prevent any current infection from worsening, or absent infection from beginning. Hope this makes sense.

Clean the area with hydrogen peroxide and put pressure on it with a cloth or towel until the bleeding stops. Once there is a scab leave it alone since if you clean off the scab it will bleed again. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Misty.

an open and infected tumor should be removed. If it happens to be a lipoma (fatty lump) then this should be curative. If it happens to be another type of tumor, then your vet should do an x-ray of the lungs to check whether there are metastases. I think you should get a second opinion from another veterinarian or a veterinary oncologist.

This looks like it could be a cyst or a skin tumor like a hemangioma. I find that once a skin growth ruptures it tends to happen again, so I would definitely recommend making an appointment to see your veterinarian. They will probably recommend surgically removing this growth.