A rescued pup

So the other day I was given a dog that wasn't wanted and she looked like crap. She is a mini Dachshund and her ears feel like leather and you can see all the bones in her tail and back she has some missing hair, and last her nails were so long that even when she walked on carpet you could hear them click together. I don't know how people can treat animals this way, shes nervous doesn't like loud noises and when the friend of mine went to get her I asked her to get her food and any vet papers that they have on her but when she asked about these things they told her that she had never went to a vet and they weren't sure what food she eats but they did have a small bag of kibbles and bits ( which for a dachshund isn't good), they also told her to be careful around kids with her because where she was living they had kids that beat up on her, these things really upset me but she is in a much better place now and she will grow big. The other thing they told me is that she was like a year old but I'm not sure of that either and if she is then she really has had a bad diet cause her teeth look really bad. So my point is if your going to get an animal especially a dog do your research , do some basic training (like house breaking), if its a small dog teach your kids not to chase them or things like that they can get hurt easily especially dachshunds they have very long backs that can break easily or slip discs, get them good food I understand than in these times it hard on the pocket but at least get something that will help them live long and healthy, keep there nails trimmed short ( if they are to long its like they are walking in heals all the time), bathe them and put frontline or something like that on them so they don't get critters, check the web for your dog and see what others say is good for them , and last but most important take them to the vet they need shots and check ups just like we do the things that dogs and cats can get like parvo can come on suddenly and kill them over night and it can be passed to other animals. If you have anything to say about this topic I would love to hear it and maybe do more on it just let me know.