Is the use of animal/ non-human characters allowed in advertisements?

All characters in the product packaging are allowed to be used in the advertisement as their intended purposes. 
Please refer to the Registered Medicinal Products Advertising Approval Guidelines:

Paragraph 3.2 General Principles, subsection 3.2.2 – Advertisements must contain information that is reliable, accurate, true, informative, fair, objective, unambiguous, balanced, up-to-date, verifiable, and non-offensive.  
 
Paragraph 3.5 Animal Image in Advertisement - Animal images in advertisements should be used with caution to ensure that consumers are not misled into believing that the advertised product is intended for veterinary use.