I don't mean your typical cat/dog/gerbil, but please feel free to tell me about those.
Mine was with a sheep! I hand reared her (i.e. bottle fed her) since she was a small lamb as her mother had rejected her.
Over the years, she was a very friendly sheep and would look into the garden (field was surrounding the garden) and I'd feed her bread.
Time wore on, she went on to have lambs of her own etc. I had been away for years travelling. My dad was out in the field and I was out in the back garden chatting and suddenly, my Dad says, she made a bolt for the fence! So she rocks up and I feed her bread.
It's unusual in that I'd have reared other pet lambs but once they become mothers, they don't want to know you and just behave like the flock, but this particular sheep just seemed to adore me and remembered my voice years later!
I know you can have close bonds with animals you're in constant contact with, but any unusual bonds to share?