Alison follows her friends to a summer camp for cheerleaders. But she is having bad nightmares. Her boyfriend has followed her to the camp but he seems to be more interested in the other girls, girls who sooner or later are found brutally murdered. Alison starts to believe that she has a split-personality who kills them.
A dog is shown at the start and you can occasionally hear it growl but it never has any scenes with it that are major. LEt alone any scenes where the character dies.
Though it's implied the main character may go to one. She's had multiple nightmares of the characters' demise and (With Corey getting the cops to believe the main character did the murders) when telling the officer while in a stretcher he doesn't believe her.
When one of the cheerleaders (Pam I believe) is found dead it looks like her weapon is wiggling a bit. My friend I watched it with comments it could be maggots on it.
The butcher cuts meat at the start. One of main characters at the start has her pom poms cutting her and in a later nightmare cutting someone else. Besides that, there's only stabbing.