I just wanted to give a quick thanks for editing and working hard on articles lately. ^_^ I've been working on another wiki which has been taking up a lot of my time. Thank you for giving this wikia attention.
Generally, animals have their own pages. If the animals are different enough though, they can have their own pages. You can make separate pages for these candy animals if you want to. It should be fine.
And no, there isn't a template for friendship/heart events. The only thing is that we don't have a separate heading for each event, which some people seem to include. If you want an example of how heart events are laid out on more complete pages, you can look at the marriage candidates for Animal Parade or Grand Bazaar.