Feeding puppy boiled chicken

Question
I have had my Maltipoo for a couple of weeks and have been feeding her Royal Cannin. The breeder told me that occasionally she added boiled chicken to the dry food and the puppy seemed to eat this.  My vet told me that the feeding the boiled chicken was spoiling my pet and she should just be eating the dog food.  I have tried weening her off the chicken however now she doesn't want to eat it.  Is it bad to give her the chicken and am I realy spoiling her by adding this to her food.

Answer
Puppy chows are carefully formulated to give puppies exactly the nutrients they need.  Adding things such as chicken are largely an indulgence for the owner at the expense of the dog's health.  Chicken may be high in protein, but lacks many other things a dog needs.   Breeders aren't required to have any training or do any study.  Many of them are poorly informed clinging to past myths or chasing the latest unproven fads.  Trust your vet.  
Evaluate the dog as illustrated in this link, http://www.longliveyourdog.com/twoplus/RateYourDog.aspx You may want the vet to confirm your judgment. Adjust the dogs food and exercise as needed to reach its ideal body condition. Some German Shepherds and other breeds may refuse to eat enough to completely hid their ribs. As long as you are feeding a concentrated, meat based chow, the best thing is to accept it.

The worst thing you can do is to bribe a dog with rich foods into eating more than it needs. Instead, Put down the dish with what the dog should eat, and give it 15 minutes to eat. Then take it up. Do not give it anything to eat until its next scheduled meal. In a few days, it should be eating what it needs. Continue to check its ribs and adjust the food as needed. This is not easy. I had a Shepherd go 3 days on a few nibbles. I was a wreck, but she was fine. It is almost unknown for a healthy dog not to eat what it needs. Unfortunately, in too many cases, it is less than the package says, and less than the owner thinks the dog should have. Many dogs are quite good at holding out for tastier chow. Like kids, sometimes it calls for tough love.