
Both the rusks and the Creamed rice will encourage a dog to develop a sweet tooth, it is why they go down well, and of course in breeds where it is a job to get the pups to start weaning it will be a popular choice.
The sugar may actually be an advantage in toy breeds that suffer from low blood sugar issues, but for most dogs sugar is not something they need in their diet at all, so best not to start them on it.
It is one of the things added to some dog foods to make them palatable. All th soft pieces and soft chunk style foods and treats are full of sugar (molasses etc) as this gives them that texture.
That kind of feeding comes from the era when most dogs lived on table scraps with the addition of meat if they were lucky and foods formulated for dogs were a newish thing, and old habits die hard.
I do feed my dogs all our scraps,b ut there are five of them and they make up a tiny proportion of their total diet and are more a treat than anything else, and I am sure some of them have sugars and other less healthy things in them.
I wouldn't start a fast developing baby puppy that way, it would be puppy food or species appropriate whole foods.
Barbara and the Grey Curly Tails.