Is there a way to add other animals that you can care for in your services besides dogs?

For now, the tagline and body of your profile is the best place to add it. Your current tagline is "Loving care for your pets" - you might be able to change that to something like "Loving care for dogs, cats and horses" or something similar. That line shows up in the search results, so owners would readily see it without having to look for a list of services in the body of your profile.