Joining the Fellowship has reminded Boromir of a childhood longing. Something he hasn't had time to think about in years being the favourite son and pride of Gondor and all that. When he was a child he'd always wanted a pet but his father had never allowed it. Of course he was allowed to have horses, horses have a purpose, but the kind of pet Boromir had wanted wasn't a horse. What he'd wanted was something he could play with and cuddle, something that would faithfully follow him around and could sleep on the end of his bed. And now that he's forty he's finally got what he always wanted. And not just one pet but two. These pets are great, they're like puppies; playful and faithful and adorable. It's his job to take care of them. He has to feed them and train them and carry them when their legs get tired, things like that. At night they curl up beside him and keep him warm while he sleeps. And during the odd times when they do get to take a break and relax, Boromir gets the chance to play with his pets. And the really brilliant thing about these pets, something he never imagined his puppy would do when he was a child, is that these puppies can talk! Imagine it, puppies that can tell you what they're thinking. Puppies you can hold a conversation with.
Strictly speaking Boromir's new pets aren't puppies, they are actually creatures that Boromir has heard tales of since he was a child but never really expected to see, like tales of fairies or something, which makes owning two of them all the more magical. Boromir's pets are Hobbits, and Boromir bets even his father couldn't say no to a pet Hobbit.
The only slightly disappointing thing about his pets is that he didn't get to name them. But it's alright because the names they came with are pretty cute. The one with the light hair is Merry and the one with the dark hair is Pippin. Now Hobbits being like miniature people means you can teach them lots of tricks, like sword fighting. Boromir's put quite a bit of work into training his pet Hobbits and they really are starting to get the hang of it. But being like puppies means that their attention spans aren't great and that they do have a tendency to be naughty whenever the opportunity presents itself.
In the time Boromir's spent with his pets he's really grown to love them, it's not an exaggeration to say that he'd die for them if it ever comes to that.