Pet adoption is a great option as shown in this commercial.
Positives: informative love the animals
Improvements: mic 'pop' could have displayed the call to action throughout the entire PSA (where do I go to adopt? website/phone number/address of shelter??)
Positives: nice shot variation informative narrator
Improvements: try to find a different way to tell your message have peoples faces with their pets when they say adopt
Positives: nice use of stats nice use of animals to promote psa
Improvements: over use of termonology adoption dont just show animals in cages