My dog has a fluid filled sack on her side, I'm not sure what it is. It seems to move around when she walks. I can touch it and she doesn't bite me (thankfully). I called the Vet and they said it could just be fluid and they can drain it. I'm wondering if it's something worse?
I have never even heard of this before, is it some type of issue that comes along with a dog cold? I wonder if cats get them too, I have really never heard of it before though, news to me.
My dog has one of these on the side of his leg. I compare them to the 'fatty tumors' that humas get (I've got one). They aren't really anything to worry about unless you end up with them all over your body.
Fluid sacks? 
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