Book cover for printed and digital non-fiction coaching guide

I'm looking for someone who can design a neat and professional cover for a digital and print book. I want more than stock photos or bad fonts - that I could do myself! I'm happy to pay well for high quality work that sets my book apart. I've not decided on the print size yet and the print has not yet been set professionally, so I'm looking for vector-scaled images that can be used. I'm happy for credits, but the work will be used commercially so I expect it to be mindful of copyright regarding images. Photos, design or artwork are all fine with me. It's also the beginning of a series, so I'd be looking for someone for repeat work with the same theme/fonts/styles.

The book is a guide for modern dog trainers coaching them to work with the human side of the relationship in order to solve problem behaviours or give the client maximum return. It's light-hearted yet rooted in organisational and social psychology, client-centred coaching and in relationship coaching. I want something that reflects me and my ethos: open, friendly, supportive, and, above all, very professional. Obviously key words are dogs, coaching, human-canine relationships and human interpersonal relationships.