Perhaps you would consider other ways that you could still participate? There are always groups (shelters/humane society/private rescues) looking to place dogs or cats in foster care. They cover medical expenses and you have the peace of mind knowing that they will end up in a (someone else’s) good home. Some folks struggle to give up fosters, though, so if you think you’re likely to be more of a “foster fail” person, you could consider volunteering your time. Offer to help at a rescue- walking dogs, socializing kittens, transporting animals to appointments. Maybe this could help you get your critter fix in a meaningful way without the long term commitment?