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Not being funny, but the second sentence did specifically say no speculation please. I'm worried about my dog and was seeking comments from pet owners who had experienced anything like described. I also said I had taken him to the vets and was seeing the vet again regarding him, so I am not looking for internet diagnosis.
As for the money and further tests, there are reasons for putting that. Last year I had no choice but to put down a dog having spent about £300 to find out that to treat him would cost thousands. In November I rescued a homeless cat that had been hanging around our house, and he so far has cost hundreds of pounds and is ongoing for life on medication. Finally, the puppy is a Dachshund which aren't cheap, and was a present to my wife as she has always wanted one, so please, no comments either about getting a rescue dog instead (which I have for the last 30 years, two at a time). I'm on PIP and a small pension, so don't have a lot to spare, especially at the moment having forked out so much over the last two months. I specifically wanted experiences as this would maybe help raise valid points with the vet, and to maybe help me prepare for the worst, nothing more.