However even 18 hours is not considered abnormal for a Chihuahua. This includes naps.There are 2 types of sleeping. One is a lighter sleep (called slow wave) and the other is the deeper sleep (known as REM-Rapid Eye Movement). Dogs, just like humans do have these 2 different types of sleep.
Probably the best known snake in the world, the Rattlesnake is a pit viper found almost everywhere in the United States, and is capable of a deadly bite. Its trademark rattle strikes fear into anyone who hears it.
Fortunately in North America there are about 20 species of venomous snakes. Chief among them are 16 species of rattlesnakes mostly found in dry, arid regions in the south except the timber rattlesnake found in the northeast. There are also two species of coral snakes, one species of cottonmouth or water moccasin and one species of copperhead.