Doggy hair salons are in. Supply chain software and cable TV are out. Of the Nasdaq 100 index that is. On Friday, the Nasdaq Stock Market announced that it was dropping and replacing 15 companies, a change that will go into effect on Dec. 23. As expected, the reweighing lightened the index's load of tech stocks, replacing some, including i2 Technologies and Charter Communications, with retailers, such as PetsMart, or energy-related companies like Patterson-UTI Energy . The other companies being added are: Expeditors International of Washington, (EXPD), Ross Stores, Dentsply International, Lamar Advertising, Whole Foods Market, First Health Group, Pixar, Fastenal, American Power Conversion, C.H. Robinson Worldwide, Gentex, Henry Schein and Ryanair Holdings. Other companies being dropped are: Abgenix, Andrx Group, Applied Micro Circuits, Atmel, Conexant, Cytyc, Integrated Device Technology, ImClone Systems, Protein Design Labs, PMC-Sierra, Rational Software, Sepracor, and Vitesse Semiconductor.