A few days a ago I started mixing Frankincense oil with Castor oil and applying it twice a day to a lump my dog has under one of her nipples (it looks a bit like it's a blood clot, but it could be something worse). anyway It's slow growing and doesn't seem to be getting any bigger now, it doesn't really bothering her either, so I'm going to keep applying the C&F mix for now. She is 13yrs old, and I feel having 'vets messing' about with her at that age especially, is not a good idea at all.

Your dog can take Ivermectin or fenbendazole, or both. Tractor Supply, Amazon or pet store.

Yeah, I know about Ivermectin etc, but here in the UK it's not at all easy to obtain, even the small animal 'vets' here don't seem to sock or use it. And I'm unable to order from Amazon.
I've been brought up using holistic methods all my life, my farther was A Chiropractors in Calif', and my Brother is also but in London. So naturally I'll only take an animal to a vets, if there is no other option.

What about DMSO from a horse supply store, or Farm store?
Apply to the affected area daily until area appears normal.

Thanks, for now though, I'm going to continue with the castor oil/frankincense mix, castor oil being one of the fastest carrier oils to get whatever it's mixed with absorbed deeply. I was making a mix-paste of Bicarb' with C'oil before that, which was also good, but messy, and dog really liked licking it way too much! At least there are still some other mixes-methods to try, before I go hunting around for shops/suppliers that are actually very thin on the ground here. So I'm not overly concerned (and neither is dog) at this stage.