Its impossible to answer. How old is the dog ? What breed ? What have you been feeding her ? Male or female ? Health history ?

Yes you might get some weird answers by people poking in the dark because they want to sound smart , or they want to help, but its impossible for any reasonable answer in the absence of more information.

Nevertheless, I'll offer that if its a pea-sized lump, that's nothing. I know people who have bean sized lumps that have lived with them for decades. OMG, what you gonna spend on the dog ? $5000 ? $10,000 , a million bucks on vet fees ? I don't know anything but feed a dog its natural diet, which isn't store-bought soybean/corn laden granular chunks, its evil to feed a dog store-bought food. Dogs eat guts, and crap they find in the yard, that's their code. Human discardments are dogs' meals and it can even be a few days old, but not too old, even a dog will sniff stuff it won't eat. But guess what, they even eat shittt if it smells good. It'd be like taking a buzzzard that's used to eating dead deer and squirrels, and start feeding them commercial "buzzard chow" that's full of corn and soybean crapola, then say "my buzzard has a lump up its asss, what should I do ? These people on here don't know anything, but Nature teaches, if you have ears to listen. Commercial dog food is evil. They only eat it because they are hungry and you pen them up and that is all they can have. Set them free and watch them go eat what they NEED. Just like people , they "trust" their masters. Some fools have a choice, other fools don't.

If you can get good meat I would start with liver, very high in vitamin content.

What brand of dry food? Choose your dry food carefully and only use one that uses human grade ingredients. If the source meat is not deemed eadible by humans then you are feeding your dog waste meat from sick animals.

Consider sprinkling on sodium ascorbate on her food as well, approx 1-2g a day. Yes I know dogs make their own vit C but compared to most animals are poor producers and any significant stress on the dogs body (ie cancer) will deplete what the doc can make on its own.

Long before iodine, our family dog had rectal cancer. I put him on raw food; his symptoms was much better for a couple of months, then we decided to let him go.

If doing Iodine for cancer, I would give the dog more than one drop. This is what my very healthy cat have almost daily. 10 drops and we still talk supplement. half a gram, then we talk medicine.
- Turmeric is good, but not very well utilized raw; I would heat it up a little, with the omelette or something, coconut oil, as the curcumin is fat soluble.

amygdalin in raw apricot kernels. It always surprised me that a dog would eat an apricot kernel, actually they won't quit at one. My dog never had cancer but I gave her half dozen of those periodically. First time she tried it, she didn't want it until I bit it in half and the benzaldehyde aroma became evident, after that she'd gobble em. In the lymph you say ? why not try Naessens' "714-x", a material that's designed to be injected in the lymph ? He was no dummy you know, he identified the somatidian orthobiology cycle using the darkfield mic, etc.

Archus, even if you can't find the ultra clean meat from a butcher, consider feeding your dog a raw diet. I can guarantee you that meat in commercial dog food is no better than meat for human consumption.