A. Lumps and bumps are very common in dogs and can be caused by a variety of reasons ranging from allergies and rashes, to infections under the skin, to tumors, cysts and other growths. The neck also has a large amount of structures including lymph nodes, salivary glands, thyroid glands, nerves and more making it hard to determine what the problem is without examination.
As the location of your Boxer's swellings are near the face and neck, and because they are spreading rapidly, it may indicate a severe allergic reaction to something and should be looked at by your vet or emergency clinic as soon as possible. Swelling around the head, face and neck can quickly become serious, especially if it begins to affect airways.
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