|I can't tell you how to paste the animated gif, but I will point out why it might not be such a good idea.|
What you send may not be what the recipient sees.
The presentation of the email to the recipient is primarily based on the recipient's email client and secondarily based on what was sent.
With the myriad of email clients available I doubt that you will be able to format an email that will present itself the same way to all recipients.
Cell Phone based
Yahoo, Hotmail, gmail, etc
What you think is a great looking (or even professional looking) email may end up looking annoying (read: non-professional) to the recipient.
"Keep It Simple" really works in this case.