So step one in including them in the wedding is making them stuff. Ava will be wearing a flower collar to dress up (and hopefully a bath to help control the hair she produces like crazy). Wilson will get a tie for his collar, so stay tuned.
I was going to try and make this into some kind of tutorial, but all I did was glue artificial flowers to a collar I got a while ago on a super discount. Just arrange them however looks the best. And trust your judgement.