Suddenly cribbing!

[SusieJane]

I've been away for two weeks, and when I came home, i found that one of my shetlands has started cribbing ~
They're all 12+, never cribbed before, but suddenly one of them is gnawing the fence everywhere!

Not sure which one of them it is, as I say the lady who looked after them hasnt' noticed.

Any ideas?

 

[AmyMay]

Chewing the wood rather than cribbing?????

 

[Shilasdair]

Lack of fibre in the diet (give hay or hi fi haylage or speedibeet), vit/min deficiency (give supplement), stress causing gastric ulcer (remove stressor), possible worm burden (worm for small redworm and tapeworm), sharp teeth (rasp 'em)
Any good?
S

 

[0ldmare]

Are you sure its really cribbing and not just chewing/eating wood? If its chewing try giving it a salt/mineral lick as there could be a mineral deficiency. Also its might be more interesting to the ponu than chewing your fencing!