Large animal practice seeks practice software

I will be running a private practice for large animals from the beginning of 2019 and need software that will make my day-to-day work easier.

I have the following requirements for the software:

• Suitable for a large animal practice
• Create application and dispensing receipts
• Antibiotic monitoring
• Billing (based on veterinary fee schedule and free)
• Automatic import of laboratory data would be helpful
• Not too extensive
• Windows-compatible
• Monthly payment preferred
• Cloud-based solution preferred
• Demo version would be helpful

I am planning to set up a software workstation that I can also use when I am on the road.