Originally Posted by Joshie
You need to take her to the vet. Minimally, call the vet. If you can't afford vet care you should see if your county has a free/low cost clinic.
I definitely agree. Or call your vet and ask if they will accept payments. The tumor may just be a fatty tumor; I know it's common with some larger breeds and my rottie had one. They're no big deal and if they need to do surgery for something else they can usually take care of them at that time. But if it's not been checked it could be cancerous.
I've got another rottie now that has bone cancer. It's very invasive and spreads fast. The vet diagnosed him and gave him about 6 weeks. He's on medication now for the pain (it's in his leg and he limps when he walks) but the day will come that the leg will swell badly and the pain meds won't work anymore. Then we have no choice but to put him down.
If it turns out the mass in your dobie is cancer you need to know that. If you can't find a low cost / free clinic and your vet won't take payments, maybe you can find another group that will help? Perhaps a dobie rescue group? Even if you have to surrender your dog to get it the help it needs, it's better than it suffering.