I’am so very sorry for your loss,It is not your fault if that vet said to bring her back in 3 months,but if she were my dog I would’ve taken her back when I felt she was loseing to much weight,that vet is at fault here not your GMA,or you,and that vet should have checked out that lump out on her,and not say to bring her back,there had to be something terribley wrong with Yukon,I hope one day you can have a long talk with that vet and ask him what went wrong with Yukon.He would not be my vet.I had a vet like that he took care of my cockapoo for 17 yrs.but he messed up and forgot to tell us that our 17yr. old dog had kidney failure,and was not going to make it,I let that dog go for 4hrs. and had to have her put to sleep,and I now have a new cockapoo,but I have a new vet,But remember Yukon is in a better place free of pain and suffering.
You said yukon did not like being inside,my daughter has a husky and he does not like it inside either,but in IA. it gets 40 below zero or colder,but that dog is in the house in a nice warm basement,and don’t mind it at all.I’am so sorry for your loss.