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My Poor Labrador Is Sick Please Help!

My poor 8 year old black lab is sick! I love her soo much. My parents don't think it is nessasary to bring her to the vet, but i think we should. She is very tender on her back end. Does anyone know what is wrong with her? Latley she has been very itchy there but there is not signs of a rash. I hope she is ok? What should I do. P.s. I added her picture