Top things that would be useful for me.

Be able to add forms for clients to fill out.

Be able to have clients pick options when signing agreement.

I know this is more difficult but I would love to be able to choose what information I can ask for on pet parents profiles like add multiple emergency contacts with different descriptions, dogs weight, proof of vaccination, etc.

Another cool but unimportant thing is expenses. If there could be a place to put in what we have spent, what it was, category, etc.