Sick 6 month old puppy

[vperr007]

Hi there! I'm having a problem with my new puppy that I adopted a month ago. At first she was energetic and loved to play fetch and would run everywhere instead of walking. Now she seems bored and uninterested in everything (toys, food, treats). She'll only eat chicken, steak, or beef but not her dog food.

I've started to notice she sounded a little stuffy in her nose around 3 days ago but when we went outside it cleared up. Again tonight she sounded stuffy but when I took her for her walk/run it cleared up again.

As a college student I don't have the money to run her to the vet if I can help it . If it sounds like serious please let me know and I'll take her to the vet ASAP. Thanks!