Old Horse with twitching problem. Please Help!?

Hi

I am sorry your horse has twitching problems

It does sound from description as though something is irritating his skin. This could be flies or mites on the skin surface.

Have a really good look on the skin areas aground the shoulders, but also looking into his mane and tail base as these are the commonest place lice live. The look like tiny specks of brown and can be seen to move if you look long enough. It is easy to treat with lice pour ons.

The other things which could cause muscle twitching would be pain in the area of the muscle from a strain or some more unusual muscle disorders.

Horses can tremble when they 'tie up' but I would expect him to be showing other more generalised signs of discomfort.

The more significant muscle disorders such as tetanus would be progressive and he would be visibly unwell and your description doesn't fit this.

So for the time being I wouldn't be concerned.

Have a good look for any skin parasites/cuts/rashes.

If you find nothing then observe and if it persists another day then get a vet check, if new signs are appearing, he is off food, rolling or the twitching is affecting other muscles then get a vet out straight away.

Good luck and I am sure he will be fine

Talk to your vet.