I have just took on a ducking from a friend who I didn't think could look after it properly. I believe the duckling is about a month to a month and a half old. It's losing its feathers around its eyes and on its back, at the base of its neck. It has left small bald spots. When I try to introduce it to water for swimming, it will swim and wade for about 5 mins then it seems like it can no longer swim and begins sinking. I quickly remove it from the water and put it in a towel to dry it and warm it but its legs and feet are really frail and it cannot stand or walk. It seems like its completely lost the use of its legs. This will last for around 10-20 mins til its completely dry and warm. Also, where the feathers are missing at the base of the neck, on its back the remaining feather/fluff looks like the ducklings skin has been weeping onto it and the fur is sticky. There are no wounds on the area. I have no idea what is wrong. Could it be that its because my friend was giving the duckling the wrong diet and once the duckling has been eating properly for a while then it might heal? Or should I be taking it to the vets? Apart from the feather loss and the temporary loss of use to its legs the ducklings behaviour is fine. Its eating and drinking fine. I'm not entirely sure what a ducklings poop should look like but its quite runny, mostly white with a small bit of brown. I have it at the moment in a plastic tub and I cover the bottom in bath towels and lay paper towels ontop. I change it all the time and it constantly has water and food available to it. I was told that it was most likely to be that its just because my friend was giving it the wrong diet and now that I am giving it the correct diet and looking after it properly then it should get better soon but I'd just like a second opinion incase there is something wrong with it.