Some animals do not need anything but food and water lol.
There have been some dogs that have been down right neglected not just emotionally but I mean really neglected. Parasites, not being fed, etc.Animals that still proved to be great even though they were neglected and their owners idea of bringing one in properly was starving them down! I think its all individual based and dogs on both end of the spectrum can be equally successful. So in return of you not going that extra mile could mean you having to cull what couldve been everything you ever wanted in an animal.