Most signs of arthritis are related to mobility. Often one particular joint is affected more than the others, and this can lead to your dog limping or standing with less weight on the sore leg than his other legs. However, in the early stages, your dog can often run freely and forget about the discomfort when he sees something to chase after. Therefore, it can appear that the lameness comes and goes and is worse before a walk than during the walk. A dog with arthritis has a tendency to be worse the day after vigorous exercise. He may chase happily after a ball one day, but the next day when the joint is still inflamed, he will often limp more than before. Arthritis can cause your dog to avoid activities she once enjoyed. Your dog may be reluctant to go for her favorite walk or refuse to jump into your vehicle or on furniture. Arthritis causes pain for your dog. Look for whining when he walks. Your dog may also nip at you or seem upset when you touch the affected area. If your dog has an early stage of arthritis, she will often be stiff when she has been resting for a while, such as first thing in the morning or after sleeping. She may spend time stretching and padding around in a stilted way before her joints and muscles warm up and she can move more freely. Pain and discomfort can also affect your dog's mood. Pain can make an animal withdrawn or depressed and change his habits. Pain can also make your dog short-tempered and prone to snapping or aggressive behavior, so a change in his behavior should trigger you to look for an underlying problem, like arthritis.
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One-sentence summary -- Take notice of any limping. Watch for avoidance of activities. Look for signs of pain. Watch for stiffness. Watch for mood changes.

Tap the Settings app icon, which resembles a grey box with gears on it. This option is near the top of the Settings page. It's near the bottom of the "General" page. You'll find this near the top of the screen. Doing so opens a list of keyboards that you currently have active on your iPhone. If you see an option labeled Emoji in the list of keyboards near the top of the screen, your iPhone's emoji keyboard is already enabled and you can proceed to using the keyboard. If not, proceed. It's near the middle of the screen. This will bring up a list of available keyboards. You'll find it in the "E" section of the keyboards page. Tapping it will immediately add it to your iPhone's keyboard. Press the Home button at the bottom of your iPhone's screen to do so. You can now use emoji from your iPhone's keyboard.
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One-sentence summary --
Open your iPhone's Settings . Scroll down and tap General. Scroll down and tap Keyboard. Tap Keyboards. Look for the Emoji keyboard here. Tap Add New Keyboard. Scroll down and tap Emoji. Close the Settings app.