More than three months. Puppies forty-two to ninety days of age for the vaccine immunization stage and weaning period, intestinal function is weak, not able to digest and absorb snacks, and may cause diarrhea. If a puppy has diarrhea, it may disrupt the normal immunization schedule and reduce the effectiveness of the vaccine.

When feeding them snacks, it is also important to note that you can't feed them too much, snacks are used as a reward for training, or occasionally fed, if often fed, it is easy to cause them to be picky eaters, and no longer like to eat the dog food, snacks contain nutrients that are far from being able to compare with the dog food, so it can't be a substitute for the dog food.

Expanded information:

1, bite gum snacks. Bite gum snacks are mainly made of pigskin or cowhide, very tough, often give the dog to eat, you can let them grind their teeth and pass the time, then they won't be in the house to cause havoc, or chewing things in the house.

2, teething snacks. For example, teething sticks and teething cookies. The main function of these snacks is to help them grind their teeth and remove plaque and tartar from their teeth. Although the owner often have to help them brush their teeth, can effectively clean the teeth and mouth, after chewing and friction, can remove tartar and plaque more thoroughly.

3, meat snacks. Some of the meat after the bone, and then dehydrated and dried, it becomes a dog snacks, common chicken jerky, beef jerky and pork jerky, its flavor flavor and good taste, many dogs love to eat. But these meat snacks can not buy too much at once, because there is no added preservatives, can not be kept for too long easy to deteriorate.

4, beef ribs or beef bones and other bone snacks. Generally this type of snacks are at home to make their own, the process is also very simple, first go to the market to buy some cow ribs or cow brittle bones, cleaned and cut into small pieces, and then boiled and then dried on it. Bones are rich in calcium, often give them to eat can replenish calcium, but also can exercise their teeth.