The milk the puppy's mother produces contains the exact combination of nutrients it needs to grow healthy and strong. It should make up the entire diet for the first four weeks after birth. If you actually bred the litter and have the puppies and the mother dog, the introduction of "dog food" typically starts around one month of age. If you try to wean the puppy too early, his health will be compromised. If possible, let your puppies watch their mother eating. Puppies like to copy and they will understand what to do much better by following her example. Puppy kibble provided three to four times per day will allow the puppies to start investigating and ingesting the new food. Soak the kibble in water or puppy formula. The puppies will start licking and eating the new food as they become more familiar with the taste and new texture. The puppies will also walk through the food and make a mess. You will need to keep on top of keeping things clean. Make sure the new food is designed for puppies. If you are bringing home a new puppy, stick with the same brand your puppy was fed by the previous owner for a few weeks before deciding to change to a different food. Food changes should be done gradually over a week or two to prevent stomach upset and possible diarrhea. Add in small amounts (about 10%) of new food to the old diet until you reach 100% new food. Unless your veterinarian recommends an abrupt change in diet, take your time. It might be tempting to give your puppy enticing foods like bacon or ham from the table, but do not get into the habit of doing this. Table scraps will often make your puppy vomit or give him diarrhea. Giving your puppy table scraps may also lead to obesity and even pancreatitis. Bear in mind that the more people food you give your puppy, the more he'll want, so it can interfere with training and even cause behavior problems. Consult your veterinarian about dog safe supplemental feeding. Low fat options include vegetables (green beans, carrots, broccoli, etc.) or tofu or skinless chicken breast. Remember, everything in moderation and you have to be cautious of creating a picky eater. Toy and miniature breed puppies are predisposed to low blood sugar (hypoglycemia). In extremely rare instances, the puppy's blood sugar can drop and the puppy will be lethargic. In severe cases, the puppy can start having seizures. This is an emergency and you need to take your puppy to the veterinarian immediately. You can try rubbing Karo syrup on the gums to help, but still take your puppy to your veterinarian. Providing access to food all the time or every 3-4 hours for the first 6 months of life for toy breed puppies will help prevent dietary based hypoglycemia. For larger breed puppies, feeding three times per day is generally sufficient.
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One-sentence summary -- Let your puppies nurse for the first four weeks. Introduce small quantities of puppy food at four weeks of age. Be consistent with the type of food you give your puppy. Feed your puppy his special food and nothing else. Watch for the signs of low blood sugar in small breeds.

Animals who have the rabies virus may engage in behaviors that are not typical for that animal. For example, a wild animal may lose its fear of humans and come towards them. Similarly, a nocturnal animal may come out during the day. If you see an animal doing something atypical, get away from it and move to safety. Call animal control and tell them about the animal, including where it is and what it's doing. Don't approach the animal. The most common sign of rabies infection is overly aggressive behavior. Aggressive behavior, and physical contact that often results, serves as a major reason for the spread of rabies to people or other animals. Normally tame animals might growl, bark, or snap at people. Wild animals may run or try to attack people. Infected animals may show signs of destructive behavior, such as hurting themselves, property, or the environment around them. Infected animals tend to demonstrate some sort of anxious behavior soon after clinical signs of infection appear. Thus, any animal exhibiting strange behavior should be handled with caution. Anxiety may manifest through nervous ticks or irregular movement. A rabies-infected animal may demonstrate anxiety by licking or chewing on their initial point of infection. Anxiety may make the animal seem fearful of contact with people or other animals. Anxiety may manifest through uncharacteristic shyness or irritability. Thus, normally friendly animals will be less social. While infected animals may appear aggressive or anxious, others show signs of being friendly. Ultimately, friendliness in infected animals is one of the biggest dangers to humans or other uninfected animals, as contact with an infected animal can lead to infection. Stay away from stray or feral animals that seem friendly. A friendly animal can turn aggressive very quickly, especially if they are infected with rabies. Avoid approaching a wild animal because it shows signs that it is friendly. Some infected wild animals may seem unusually calm or even docile.
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One-sentence summary --
Watch for unusual behavior. Look for aggressive behavior. Watch for signs of anxiety. Beware if an animal seems overly friendly.