There are a number of reasons why your dog has a red bump on his paw. In the majority of cases red bumps on a dog's foot is not very dangerous and is likely to be caused from an allergy or an insect bite.
The most common cause of red bumps on a dog's paw is an insect bite. When a dog has been bitten there will be one section of their paw that is red and will have a bump. In most cases dogs usually get bitten in between their toes which is where a red bump may be placed. To treat this, dip your dog's paw in a bowl of water and baking soda mixture which should help alleviate the pain.
The symptoms you mentioned could be related to an allergic reaction the dog has had. This is quite a common cause. You should keep in mind that there are a large majority of dogs that are allergic to grass so this could be the reason behind the symptoms. In this instance you would wash your dog in cold water for 10 minutes while adding colloidal oatmeal in the water which should help to calm down the paw.
If you have noticed a rash on your dog, this could be caused from anything simple such as walking on a hot sidewalk. If at any time a dog's paw gets overheated then a rash could break out. Moreover, if a dog's paw has been too hot they may have suffered a burn somewhere. If this is the case rub aloe vera gel on to the affected area.
I advise you to visit a vet as they will have the appropriate and professional information that you need.
Sometimes the dogs develop red bumps on their paws due to excessive licking. Putting synotic ointment can solve the problem is such cases. But I think you should take the dog to the vet for proper diagnosis, because it could a cyst, an abscess or pyoderma.
Trauma to the foot can definitely cause a wound that may open and bleed. Foreign bodies-like sticks, foxtails, grass awns, cactus needles, and grass can penetrate the skin and then cause swelling and infection. It will often break open once it has festered. Dogs can develop masses or tumors as well--sometimes these will ulcerate and bleed especially if the dog has been chewing it. Clean the area with cotton balls and warm water to examine it more closely. If you note any pus have your dog examined by a veterinarian. It is very important to keep your dog from licking the bump; this will prevent healing and introduce bacteria to the area. An Elizabethan collar can be used or your veterinarian can apply an appropriate bandage. If it does not look better in 12-24 hours have your dog examined by a veterinarian.
The brown object you are seeing could be a foreign body (like a foxtail or grass awn) or a cuterebra. Foreign bodies are commonly found in the paws. They lead to redness, swelling, pain, and discharge. They need to be removed and often antibiotic therapy is needed. A cuterebra is a fly larvae. They are found in the soil and burrow through the skin. They need an opening through the skin to breath. This opening is often surrounded by redness and discharge. When you squeeze the area or move the larvae to the opening it can be visualize. They are 0.5-2cm in length, brown in color, and are encircled by rings. This needs to be removed to heal the lesion. I recommend having your dog examined by a veterinarian.
I f your dog is under 2 years it could be a histiyocitoma, and I'm pretty sure that's how you spell it. Histiyocitomas are benign little bumps. They should go away on their own, but the dow might try to itch them.
It is very difficult to tell about the red lump on your dog's paw without having physical examination. This red lump can be interdigital cyst which can be benign or malignant. Some dogs have habit of licking paw or sometimes an allergic reaction can cause itching on dog's paw. Excessive licking of paw can develop lump. A cancerous condition called spindle cell sarcoma can also cause lump on the paw.
So, you should take your dog to vet for proper diagnosis and treatment.
It is very difficult to tell about the red lump on your dog's paw without having physical examination. This red lump can be interdigital cyst which can be benign or malignant. Some dogs have habit of licking paw or sometimes an allergic reaction can cause itching on dog's paw. Excessive licking of paw can develop lump. A cancerous condition called spindle cell sarcoma can also cause lump on the paw. it needs treatment !11
If it's smooth bump it's probably an ingrown hair, infected hair follicle, or glorified zit. Happens a lot to females when they're in heat, etc. If it's more like a separated knobby thing that isn't smooth it's probably just a wart which won't go away but isn't harmful. Unless it gets bigger and worse I wouldn't worry about it.