In the examples below, notice that transportation and park ticket prices stay the same even when the number of days changes. If you're staying somewhere that's relatively inexpensive and not eating out all the time, you can often extend a trip from 4 to 7 days for very little money.
Some seeing eye dogs are selected from breeders specifically because they possess a certain temperament that is required of service dogs. However, many seeing eye dogs are rescued from animal shelters. All dogs who enter the training program to become seeing eye dogs must past a series of rigorous personality tests. If the dog passes the tests, they are then taken to a training facility.
Scientists have long known that dogs' eyes are physically equipped to perceive colors, and consequently that canines are not colorblind. But dogs are believed to see only shades of yellow, blue, and gray. That's because their eyes have only two types of color-sensitive cone cells as compared to three in the human eye.