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17 yr old dog with swollen glands/nodes in neck

Our elderly Chihuahua has been fighting congestive heart failure for 3 years and doing very well. He had blood work a few months ago and everything was good. But recently he has been going down hill. He cant eat out of his bowl, so I hold the food in my hand for him to eat. He sleeps a lot, is wobbley when he walks, of course all signs of his old age etc. BUT we found that on the right side of his neck, there is a "line" of swollen glands or lumph nodes.. and they have atleast doubled in size in the last week. We have decided to put him down, he is also blind and deaf... but my husband wants to know what this may be? thanks
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974371 tn?1424653129
Ahhh, I am so sorry for your little guy.  Swollen nodes are usually a sign of infection. They can also be a sign of Cancer, Lymphoma being one.  At least a needle aspiration would have to be taken to confirm that possibility.  If you check his mouth, there is a possibility he has some oral or tooth infection going on.
Such hard decisions but often the best ones we can make.  
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