3 month old gosling unable to stand

Hi all - I would really appreciate your thoughts and ideas. I have a 3 month old Pomeranian that suddenly is unable to stand. He/She was walking this morning and then a couple of hours after breakfast the whole group were calling --so I went to see. and the one gosling was unable to stand. I was able to check her over - no injury that I can see. When approached she "lifts up" and balances with her wings and goes a foot or so. She is "talking" to her family (all sitting around her) - I tried putting her in a pool- she wanted back out right away. She is currently sitting in the shade with food and water within reach. She has no other symptoms that I can see.
Please let me know if you have any advice.
thanks, Patsy

 

sorry about the double post --- I thought it wasn't working the first time. - I don't know how to delete one of them.