Causes that may cause small hard bumps on dogs’ skin:

1. Tumors

If there are hard bumps on dog’s skin, it is probably caused by Having a tumor is also a very serious situation. Generally, if a dog has a tumor, the tumor will grow larger and become more obvious. The dog should be taken to the hospital for examination in time, because the tumor will endanger the dog's life. If it is a benign tumor, the dog can recover after surgery, but if it is discovered late, it may not be curable.

2. Skin diseases

When a dog suffers from skin diseases, hard pimples are likely to appear on its skin. In this case, as long as the skin disease is cured, then Hard pimples will also disappear. For example, if there are fleas on your dog, you will also see black hard spots on the skin. This is flea excrement and can be washed away with warm water. Owners should deworm their dogs regularly to reduce the risk of parasite infection and protect their skin from damage.

3. Swollen lymph nodes

If a dog suffers from swollen lymph nodes, the most obvious symptom is hard bumps in the skin. There are lymph nodes in the dog’s ears and thighs. If the dog’s body has inflammation, the nearby lymph nodes will become swollen. Generally speaking, this symptom can be relieved by giving the dog anti-inflammatory drugs, but if the symptom persists, the owner is best to take the dog to the hospital for a check-up.

4. Bags after injection

For some dogs, after the injection, the drug has not been fully absorbed and stays under the skin, and the skin will form small bags and hard lumps. Or pimples, this is also normal and will usually disappear in a few days. Owners can also use hot compresses to help dogs speed up absorption, so that hard pimples will no longer exist.