| I have two ferrets, ages one and two, and they are both healthy and playful! I bought Casey at the age of three months, and Dameon around that age as well.
Generally, when you buy them from a Petstore, they are being fed the Marshall Ferret Diet. Get them off of this! I have found a ferret food that my ferrets love and it is extreamly good for them. It is the Zupreem ferret food. Has the right amount of protien and everything. Unless your Ferret is a pig like Dameon, you will have to switch the food gradually over a period of time. Most ferrets would rather starve than eat a new food. When I switched foods, Casey wouldn't eat it at first. I had to give her peices of the food with a supplement that she loves drizzled on top of it for over a period of about two weeks before she started eating it out of the bowl.
An EXTREAMLY good book on the care and raising of Ferrets is Ferrets for Dummies. I bought this when I first bought Casey and I haven't ever regretted it. It is an extreamly helpful book that covers everything from the personality differences of the genders, where to buy your ferret and what to look for, how to litter box train and nip train your fert, the best cage set up, health problems, behavior problems, a ferret overview...basically, everything! I'd highly suggest you purchase this book, as it will answer almost all of your questions.
When I first got Dameon he was extreamly food aggressive and if I hadn't had this book, I think my finger would have suffered a lot of ripped skin as I would have tried to rip him off of my finger after he had latched on instead of spraying bitter apple spray into his mouth to make him let go.
I wish you luck with your Fert and if you have any questions, feel free to ask! | 
ferrets and protein 
If you have any specific questions or problems with your Fert, just ask! 
