Twice I have competed in trials when it was pouring rain and neither turned out that well. In the closing in Gamblers, Remmy slipped on the grass when he went for the jump and crashed into the jump and fell. Luckily he did not hurt himself and it was his last class so we were finished.
The second time was Kiska's first ever Jumpers Class. When she tried to go through the chute (she is a very small dog) she had to try and try before she could push her way through. It took quite a while before I could get her back to running through the chute. Right after her class they did not use the chute again but that did not help her.