Possible reasons for a bulge on a dog’s back:

1. It may be a tumor. You need to go to a professional pet hospital for differential diagnosis.

2. If you have received injections for some vaccines or other diseases recently, it may be caused by improper injection of drugs.

3. It may also be caused by collision while running or fighting with other dogs.

How to deal with bulges on the dog’s back:

1. If the dog has a tumor, it is recommended that the owner take the dog to the pet hospital for a B-ultrasound examination in time. It is clear whether there are blood flow signals in the tumor and treatment is performed by surgical resection.

2. If the injection is improper, it is recommended to consult a doctor for examination to prevent cellulitis.

3. If it is caused by collision or fighting with other dogs. In this case, the owner can first give regular swelling treatment.