I've applied to veterinary but my 5th choice is veterinary biosciences which would allow you to work in a variety of areas, such as diagnostics, conservation and welfare and scientific research. It isn't as hands on but it allows you to benefit animals in a different way, and is more science focused if you like that.
Additionally, things such as animal physio, zoology courses and animal behaviouralist roles allow you to work with animals.
To actually operate, diagnose and prescribe medicine you would need to do veterinary.
Obviously, it all depends on what age you are and what you are doing at the minute if you were to do a university course. I would recommend trying to get some work experience if you can before you would need to apply to anything to give you a better understanding of all the roles.
I have friends interested in vet nursing and veterinary physiotherapy if that’s of any interest to you.
Veterinary nursing - more day to day care of inpatients, can assist in surgery such as monitoring anaesthesia and being scrubbed in passing instruments etc.
Veterinary physiotherapy - work alongside vets, under vet referral, to provide therapy to assist animals in locomotive difficulty
Nutritionists - more involved in the agricultural side - often work with vets ensuring the farm is as productive as required
The veterinary surgeons act is very restrictive in terms of other professions ability to act on the same level, and rightly so as a little knowledge is a dangerous thing.