No, I had a ferret that lived to age 9 and never had surgery
You can have one ferret but it is recommended that you have at least two. Ferrets are extremely social creatures and need company. Without it they become depressed and may be harder to handle. If you have only one ferret you will need to spend at least 3-4 hours a day playing with the ferret. If you have two ferrets you won't need to spend as long with them as they will play together.
For five ferrets, the largest cage you can afford as ferrets need room to move and exercise. Ferrets also need plenty of supervised time out of the cage for their health and welfare See related question and answer below for more information
All healthy ferrets should be on a dry food or at least mostly dry food diet. Wet food is specifically made for ferrets but should be given in moderation. A dry food diet helps maintain healthy teeth and gums.
Ferrets would need webbed feet to become semi-aquatic like the mink
It depends there is drug treatment from 5-150$ but the surgery is very expensive and you will need at least 10000$ to 25000$
Ferrets are nocturnal and they normally sleep 15-20 hours a day. Ferrets need daily activities outside their cage of about 4 hours
There are numerous dangers to ferrets, You have to ferret proof their environment, ferrets need to be handle by a responsible person (no small kids), ferrets need a special diet, they are carnivores (meat eaters) and cannot digest fruits or vegetables. Ferrets can be prone to illness and disease if not taken care of properly. They could be perceived as prey by some dog breeds.
Ferrets do no need their anal sacs removed, it is considered mutilation.
No, ferrets cannot live in a plastic storage container, aquariums, etc. Ferrets need a large wire cage (cages made specifically for ferrets) with plenty of ventilation. Ferrets cannot be caged continuously and for their health, need several hours out of their cage daily.
You need to be at least 18. You may be able to get it done younger with a parents permisission if the Dr is willing.
What makes dogs different from ferrets - everything is different between dogs and ferrets. Ferrets are not anything like dogs, there would be too much to list here. You need to read and learn about what a ferret is.
They Like to bite!