What is the ruling on opening a veterinary clinic specifically for cats and dogs, selling their food and accessories, and providing a place for their shelter and treatment, knowing that the majority of people acquire dogs for purposes other than hunting and guarding? And is it better to work in this highly profitable field or in another field that is more beneficial to the general Muslim community?

If acquiring most dogs in the questioner's country is for reasons not sanctioned by Islamic law, then it is not permissible for him to open a veterinary clinic; this is because it would be assisting in what is forbidden. Furthermore, dedicating a place to house and care for dogs could be a reason for losing a qirat of reward daily. It is advised to pursue work that benefits Muslims, even if its income is small.