1 Some sitters charge extra for administering medicine. 2  The fee is about $5 to $10 per pill, ointment application or injection. 3  Most sitters, like Las Vegas Pet Sitting, charge a fee for holiday service, and sometimes for weekend service as well. 4  This is about 25 to 50 percent more than the usual price. Again, this offers more attention and exertion for the pet or pets. 2  An overnight stay costs $50-$75. 3  This option is available for those not wanting their pet to be alone overnight. 4  The Affordable Home Sitter in Arizona offers the service for $65.