tail hair falling out ?

[Johanna&Yorkie:)]

i have noticed this past week that part of yorkies tail have fell out ? nearly everyday I'll pick up a clump from the floor or if i brush his tail with a body brush which i do all the time ( i dont use a comb) a bit will fall out?
What is it and what can i do to stop it ?

[mel16]

Have you had him blood tested? Hair loss from mane and tail can be caused by selenium toxicity. What is his diet like?

[cuffey]

Lots of possible reasons--if he is rubbing--could be pinworms

Have a read--a few possibles
www.thehorse.com/articles/24506/tail-rubbing-in-horses

[companymagic]

Silly question but how long is his tail ? If Ailsa or Amigo's tails get too long they stand on them pull clumps out.. A quick trim and keeping them plaited stops it and I have lovely long tails still..