Q: How long will behavior modification take? A: How long it takes and how many calls it takes depends on a lot of factors. The more consistent you are with your dog and the closer you follow the behavior modification plan, the faster your dog will change. Consistency and commitment are the key. It also depends on your dogs problems and how severe they are. I have had clients that only needed one consultation, I have had clients that needed many. The average is about 4-5 1 hour visits.