safe to worm an underweight horse?

Echo the 'ask your vet' on this one. I think the five day option with panacur guard?...is the gentler way of perhaps worming, but i'd definite be making a quick call to your vet to advise the best way forward for you.
 
before asking your vet get a wormcount done (around £8) then you will have some information for your vet to advise on and you will know what you are dealing with.
if you contact westgate labs they will send you a container.

I was in a similar situation a few weeks ago. I used panacur guard and it had no effect. Counted again and still 800 so presumably I have resistance. There seems to be growing resistance to PG. If you have a high count it will be important to do a further test after a couple of weeks to check the wormer has worked.

don't forget that an old horse could have cushings and this could be the cause of your weight loss as indeed teeth needing doing so if you have a low worm count there are other possibilites.
 
I personally would worm with 5 day Panacur Guard then a tapeworm dose a week later, that should be safe for any age or condition. Your vet might say at that age it doesn't need/warrant worming but that depends if it's out with others IMV; if it's not then I'd go with not worming but worming should help with condition and if it doesn't then you might have to face up to facts that age is against it - you didn't say the age or it has underlying other problems such as Cushings. The worming will either cure the problem or not, only one way to find out.
 
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