Thank you for your replies and advice. Panic over, the swelling has reduced and he now just looks like he has a double chin. It was just me preparing for the worst case scenario again.
Quick question about worming, I have just been using panacur as supplied by the vet for two and a half years. After doing research I have found we should be periodically changing the type. Having wormed recently is it safe to give a new one so soon.
Glad to hear he's improving - probably was a sting if it is going down that soon.
The advice you found on periodically changing wormers was probably not the most up to date. At one time it was thought if you change your wormer every year then it would stop the worms developing resistance to the drugs that are used. Resistance still developed and it has since been realised that this was a fallacy. There were 3 main groups of wormers and the original advice was to rotate between each group, so what happened is it took, say, 15 years to develop resistance to all 3, whereas if you just used one wormer you probably had resistance in 5 years, then you change the wormer and if 5 years time .... so you still end up with resistance to all 3 in 15 years time. (You can argue over the time frames but the principle is still the same.) Current advice is threefold: use
worm egg counts to ensure worming is required;
rotate grazing to reduce the challenge of worm build up from permanently grazed pasture eg graze the hayfield after it is cut and allow the original field to rest; and thirdly to use
refugia. Refugia is the idea that you don't attempt to kill all the worms, either by not treating all the animals at once or by putting the animals back onto the pasture they have just been on and presumably has worm larvae on it. Each time you use a wormer you are selecting those worms with resistance, so if you don't subject all the worms to that selection pressure then the next generation of worms will have genes for non-resistance as well as genes for resistance. By reducing this selection pressure the build up of resistance is slowed down. If you research the subject you may find this idea of refugia in reference to sheep, but the principles apply equally to goats. So often with our goats we have to extrapolate from sheep or cattle.