I'm going to return a dog I got for my birthday to the shelter
I'm saddened to hear this. Why would you return your dog?
All my friends who got a dog loved and adored them and I don't like dogs and I'm unwilling to learn.
I'm so sorry that you feel that way and it's probably for the best that you are returning the dog to the shelter if you can't find another friend or a family member to take care of it. Like humans, dogs and pets are also in need of love and care and should never be  neglected.
I feel happy I don't have to deal with it.
I do not think that being happy is an appropriate reaction in this situation. It may be for the best that you will not care for this animal and someone else will, but someone has trusted you with the pet and you shouldn't feel happy that you're giving it back, as the dog may not get another permanent home and may spend a lot of time in the shelter again.