What color are her gums, tongue, or the conjunctiva of her eyes?
Have you noticed any increased thirst or urination?
Vomiting or diarrhea?
Theresa
This mass may be an abscess or very possibly with her age a cancerous mass either in connection with on of her kidney's or other abdominal mass. I don't like her sudden symptoms of lethargy either. So, yes, she will need to see a vet. There are still vets around that do make housecalls but based on her symptoms she will need to be seen. If you can get her onto a blanket you and your son may be able to lift her into the car. Otherwise, I would call someone who can help you. If you are still interested in finding a housecall vet then you can either look in the yellow pages or put a call into your vet who should be able to give you a name. This does come with a significant cost however especially if they have to travel far or after hours. I wish I could give you more specifics as to what is wrong but this mass could be any number of issues and the cancer risk increases with age.
A Voice for Your Pet
15 years experience in small animal medicine
Great! Please do let me know how this turns out... good or bad. I am here for you.