Why is your miniature dachshund grunting?

Grunting in dogs are usually your dog trying to tell you its emotions. I do not know what they are trying to say but it is usually a dog trying to communicate. Like a lazy, long loud grunt may sometimes mean "Tired" or "Bored". If you are scratching your dog's ear and he/she grunts it sometimes means "Love" or "Thanks, i like that". And, finally last example, if it shows actions of being angry, and growls, that means it is "Angry". You may either try to calm him down or stay away and let him calm down himself. Hope this helps! :)