I feel for you, and although I want to tell you not to worry about it, I know I would if it were me!
One of my sisters is in an even worse situation than you. She adores pretty much all animals, in particular cats, dogs and horses. For the past few years, she has been with a guy (whom she's now living with) who is really great - except he hates animals. Before I met him, I didn't think there could be people who hated animals. I could accept that some people aren't crazy about them like I am (and everyone here!), but I couldn't seriously believe that someone could detest all animals - the cute, the scary, the impressive... all of them. Until I met this guy. At least he's been very upfront about it all along... but I don't understand how my sister can put up with not being able to have any animals, ever (for as long as the relationshop lasts, but it seems pretty solid!). She's always planned to have cats and dogs and more once she was living in a suitable home, but now she's had to give up on that idea. We all thought that after a couple of years or so, he'd give in and they'd at least get one cat... and then take it from there.
But that didn't happen.
I know I couldn't live without animals (cats in particular, of course), fortunately my OH likes most animals (and even if he didn't, he'd do anything for me, so he'd let me have them anyway
). In my future, I see dogs, chickens, horses, sheep, maybe a couple of alpacas, and I'd love some cows... and that's just for starters.
Of course, cats are in a class above all animals, though...
Looking on the bright side, if we did ever split up for any reason, he'd obviously be ok about leaving them all with me.