#8 Playtime
Happy dogs usually make their best during playtime. Quiet and reluctant are signs of boredom and ill feeling.
You should consult with vet to make sure he is not injured or sick.
#9 Appetite
Usually, a content dog meant a lot of appetites around the day. A sudden drop in appetite means something is wrong.
Other way round, an unexpected increase in appetite is also an indication to something going wrong.
#10 Brow
Dogs move their brow according to the feeling. A smooth, wrinkle-free meant worry-free.
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