Many couples are opting to make a donation to their favourite charity as their 'wedding favour'. There are some organisations that will help you do this, or you could even print out some nice table cards sharing your donation and why. And tax deductible too!
Charity Favor for Dog Lovers. This is for a wedding but wouldn't this be great for any event! These adorable sugar cookie and dog treat wedding favors to be accompanied by a donation to your local humane society. Link included for a free print-able and for the dog biscuit recipe (homemade Peanut Butter Bites dog treat recipe)