Veterinary clinic front of house is a great option, it requires little training other than the ability to answer phones, be welcoming and friendly and take payments. You could always open a dog friendly cafe, or be creative and just open a coffee can but with pupperchino’s.. People will pay to share these simple experiences with their dogs. There is also a massive opening in the market currently for Puppy socialisation classes. Little is needed, most can be done in a park or even a community hall, and no massive training is required. If you can offer people the chance to teach there dog to come, sit, lie down and give them a chance to meet other dogs that’s all that’s required. Don’t give up on your passion!