So what is he trying to hide? If you don't have other pets and an established relationship with a vet, the best time to start one is as soon as you get a dog. This way the vet has your name, and a base line exam of your dog. The vet can also look over the record from the pet store and make sure the store didn't neglect anything. In milder climates, many people are keeping the dog on heartworm medicine all your. In most states, you should be set until rabies at 6 months. That would be a good time to discuss spaying her.
Even with their shots, young dogs are vulnerable to diseases. It is best not to let her run where there are dogs you don't know how good of care they are getting. Take good care of her. the little dogs can have long active lives. Feed an AAFCO approved chow and no more than enough to hide her ribs. Dachshund's backs can't take over weight. See
http://www.purina.com/dogs/nutrition.asp?article=292.
Take you little dog seriously. She does. Do you want a really nice little dog? With somebody the right age in the family, 4-H dog training is a great idea. In my area, clubs form soon after the first of the year. Even many urban areas have 4-H. For info look in your phone book under government listings for extension or cooperative extension offices. Ask specifically about a dog or canine club. The dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog. Life is much
easier if the 2 legged pack members outrank the 4 legged ones. You can learn
to play the role of top dog by reading some books or going to a good obedience
class. Start at
http://www.dogsbestfriend.com/.