Butt jokes (Patreon)

A greeting card company I work with had this idea for a card and asked if I'd be willing to draw it. They asked for a sketch and this is what I submitted. This joke reminds me of a cartoon I did a few years ago, which isn't a greeting card (second image). 

There are a lot of 'dogs sniffing butts' jokes out there, but I thought this idea was cute.