That's a really hard question...
My Mum and I went to the dog pound one time to get two dogs, one for me, one for Mum. My Mum chose a little terrier that she was in love with from the internet and I was allowed to choose a medium sized dog... I had always wanted a husky and there was the most beautiful red Siberian Husky with the friendliest nature and my Mum said she was too big. I honestly wish that I pestered her to get the husky, but I found my dream dog anyway - a border collie cross kelpie that I called Bella (Beautiful) but I still regret not jumping on the chance to get a husky...but I don't hold it against my mum for saying no because she was a large dog so it might not be exactly what you were asking, but its the best I've got lol :)
I'm going to take this opportunity to share a photo of my BellaAttachment 54828
Truth or Dare?