I did have one gelded the middle of July and had no problem. That said it would have been a MUCH bigger problem not to have him gelded. [Wanted to drop him off at the vets on the way home from a show he got that rank OVERNIGHT.] This was a full size 16 plus hand appy that all of a sudden had stupid hormonal kick in and mentally couldn't handle it. I had little kids at the time and they were a heck of a lot more important than his nuggets. Linda
Rita, I have had several horses, even mature ones (4, 5, & 12 yrs old) gelded in summer. It may not be the ideal time, but I had bought them as stallions with the intent that they be geldings, so I didn't want to wait and deal with a stallion for the rest of the summer. The vet didn't seem concerned about the timing, and we didn't have any complications.
Where I am in SW OK, the fly problem really isn't that bad. I know in other parts of the country that the flies are horrendous, so I don't know if it would work to geld during fly season in those areas, but the flies reallly weren't a problem for me.
I won't say never as we never have and do not plan to, but circumstances may dicate a need some day! The heat isnt' as much a problem as the flies as the hosing will help keep him cooled down. But the flies, they're just an added nuisance and I'm unwilling to risk infection over something that can be done by waiting a few months.
As for losing a sale - I personally would risk that. The horses come first. If someone doesn't have the patiences to wait until a horse is gelded, but wants them gelded ASAP, they can take them and deal with the fly control and infection prevention - if they can get the vet to geld that is! I won't and explain to them why. Some people will wait others not.
I gelded the 2 of mine last august without a problem. I kept their back legs washed with cool water and exercised them. The heat makes them swell. So you have to exercise them a bit more. There is also a paste called flyX (I think) that I put on the inside of their back legs. Kept the flies away and my guys were just fine in a matter of days.
I usually don't geld in summer or anything like that... But I made a exception to my own rule yesterday. I had my shetland gelded yesterday and we haven't had any issues so far. It's been pretty chilly though so that helps alot. But little Mr. Andy I think would have been a very unhappy horse if we waited til it got really cold.... He is all clotted up nicely and everything and there's no more blood just the usual draining that you are supposed to have... He is on bute and antibiotics too though....Oh yeah lots of fly spray, clean cool water and lots of light exercising. I don't think you will have any issues if you use common sense like Belinda said.
Not the best time to do it, but it depends on the situation. I had a 2 year old done a week ago, and he's been absolutely fine. We've had a lot of wind lately which helps with the flies....he is out most of the time and in motion too. I've kept him fly sprayed to the max as well. I'd sure avoid July/August if possible down here.