>Please could you give me some idea about the honest for's and against's of these breeds
Never owned a dachs so only giving an opinion on what I DO know. I've had Chihuahua Long Coats for years. I suppose I have over a dozen at the moment (it only sounds a lot, you can get them all in a Collie bed, even with my Collies already in it.)
I couldn't have that many if they were always yapping, the neighbours would object. But I can't expect my Collies to be obedient if the toys get away with murder. There is your key. It is owners who make the toys snappy yappy little things. The vets at my veterinary hospital absolutely delight in seeing one of my Chi's. They didn't know you could get them with an even temperament. People are to blame for spoiling the breed. Or keeping them in rows of cages. I cringe at that. How can they be integrated with the rest of the dogs in the household.
I did check out the Chihuahua Smooth Coat and decided they were too aloof for my taste. The long coats tended to be more like a Yorkshire Terrier, which I am used to. One well known exhibitor of both was happy to answer my questions, and admitted that, if she could only have the one type, then the smooths would have to go. Sorry if any breeder of smooths is reading and disagreeing, as I said, all this is MHO.
I am proud of the fact that some owners of my pups (as pets) have taken them through to succeed and pass as PAT dogs. I love it that it doesn't always have to be a Labrador. Not that I have anything against Labs.
Long Coat is a bit of a misnomer for my liking. Because the coat isn't long like a Yorkshire Terrier's coat and certainly doesn't need clipping. You could easily get away with a weekly comb if you felt like it.
So while you may well decide on the dachs, don't rule out a decent long coat Chihuahua. Before anyone makes assumptions, I do not have puppies for sale. In fact, one knowledgeable breeder has hit the nail on the head. Very astute Barbara. When most litters are only 1 or 2 pups it is so easy to keep them all. :-)
They are far, far easier to toilet train than Yorkies. But you have to remember that any toy breed takes longer to train than larger dogs. Sorry if this is too lengthy, but you did ask for personal experience.
By the way, advertised as T cup IS NOT a reputable person.