The other senses of cats and dogs compensate for their visual limitations.

• Cats can hear the ultrasonic sound that their prey makes, allowing them to find their target even their prey gets out of sight.
• Cats also use smell to identify people. If you've been gone for some time, your cat may not recognise you immediately when you return.
• Dogs also have a good sense of smell. A dog's sense of smell ranges from 1,000 and 10,000 times more effective than people.

This skill helps them catch their prey. Most cats and dogs will have difficulty finding still objects close to them, but they can spot subtle movement for up to a half-mile.

While humans field of view is about 180 degrees, our furry friends' field of vision is past 200 degr...