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When we see lumps or swellings around the neck, they are usually the lymphnodes. There are lymphnodes thru out the body but there are several things to consider before you jump to cancer...lymphosarcoma being the most common.
You have a young, small breed dog...and this is not a common age for this presentation.
The vet needs to do an aspiration of these lumps to diagnose...but there are several fungal infections that do this, tick borne disease that do this and immune mediated diseases that do this...so please see a vet before you get too stressed out.
Systemic bacterial infections, mouth abscesses, etc. can do this.
I really feel it is entirely too premature to discuss cancer options...but lymphosarcoma usually respond very well to chemo with minor side effects.
Let me know if you have further questions.
Can you call your vet and have her checked today??
There are salivary glands and lymphnodes that can be lobular, but a vet needs to check her.