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.
The technical term for two different color eyes is heterochromia, and it can occur in humans too (Kate Bosworth and Mila Kunis were blessed with two gorgeous different-colored eyes). The term can refer to dogs with multiple colors in one eye or two eyes of very different colors. The condition is generally harmless and doesn't result in any loss of vision. Heterochromia is often thought to be genetic, but can also be the result of injury.