Over this past week I found a small hard lump on my dogs belly. I got her into the vet right away and on Monday set up and appointment for this next Monday for surgery to remove and biopsy the lump. While I was there, I had the doctor give her her annual shots (i.e. distemper/3 year rabies). For the last two days she has been very distant and having trouble walking and jumping up and down the stairs. At first I thought she was probably just sore from the shots, but today when I got home from work, she wouldn't get out of bed. Usually she runs to the door when I get home from work. I went upstairs and could see that she was having difficulty jumping down from the bed. And then she wouldn't walk down the stairs. I starting examing her to see if anything was wrong and I discovered a large soft swollen area under her right front leg. It is not in the location of her shots and is sore to touch. She trys bighting at me when I touch it.
So, my question is, could the swollen area be by chance from the shots. Or, should I be concerned that it could be something worse?
Thank you.
Amie