That depends on the length of the dog and the client. Working with separation anxiety is different from regular obedience dog training or other behavior modification programs. The trainer invests considerable time creating specific, individualized plans, reviewing video regularly, giving feedback, and adjusting the written criteria based on reading the dog’s body language and assessing his progress. The parent needs to make a commitment both to the program and to not leaving during dog alone during the behavior change plan. Alternatives to leaving the dog alone are making use of daycare, or neighbors, or family or friends or pet sitters who stay with the dog. 

The only potential additional cost in treating separation anxiety is the purchase of an inexpensive webcam (if you don’t already have one) and a checkup with your veterinarian (if necessary).