Another example is that Americans do not eat dogs, although people from some other cultures regard them as good food. In the United States, dogs are very important to people as pets. They are usually regarded as part of the family, almost like a child in some cases. In addition, dogs have value as protection against criminals. Thieves will not usually enter a house where there is a dog because the dog will bark and possibly attack a stranger who is trying to get into a house. Apparently, the dog's place in society as a companion and as protection against criminals makes the dog taboo as food. The taboo against eating pork occurs in more than one culture. There is some evidence that some ancient Egyptians did not eat pork. The ancient Israelites also regarded pork as taboo. One explanation for the pig-eating taboo is that pork that is not cooked sufficiently may spread a disease called trichinosis. However, most people no longer think that this is a good explanation for the pork taboo.