In the first few weeks of pregnancy, the amount of hCG in the urine gets higher very quicklyâit doubles every 2 to 3 days. There are two basic types of home pregnancy tests. The most common types of home pregnancy tests use a test strip or dipstick that you hold in the urine stream or dip into a sample of urine. An area on the end of the dipstick or test strip changes color if hCG is present, meaning you are pregnant. A second type uses a urine collection cup with a test device.
Modern sled dogs must also possess good fur, with an undercoat that insulates them from the cold temperatures where they live and run and an overcoat (also called a âguard hair coatâ) that prevents the build-up of ice and snow in windy and cold conditions.
This, along with the dogs' use in the exploration of the poles, led to the late 1800s and early 1900s being nicknamed the Era of the Sled Dog. Sled dogs were used to deliver the mail in Alaska during the late 1800s and early 1900s. Malamutes were the favored breed, with teams averaging eight to ten dogs. Dogs were capable of delivering mail in conditions that would stop boats, trains, and horses.