How to Use "wag" with Example Sentences

1. The dog wag its tail to welcome you .
2. Dogs show their teeth to warn , wag their tails to welcome .
3. To make their land desolate , and a perpetual hissing ; every one that passeth thereby shall be astonished , and wag his head .
4. The robotic cat can wag its tail .
5. Why does a dog wag its tail ?