Placeholder Image URL

Setting a Placeholder Image URL as a moving gif. The gif isn’t displayed at its real size but stretched to the img size.
Any way to fix this?

Could you maybe incorporate a css bobble instead?

http://maketea.co.uk/2013/05/04/responsive-image-placeholders.html

Or at least make the default a css image instead of adding it inline on each holder?

https://wordpress.org/plugins/bj-lazy-load/