Yes
A saddle mule is a mule used for transportation or riding, were as a pack mule is a mule used solely for transporting luggage rather then people.
Mule Skinner
Mules are sterile, a mule is the offspring of a donkey and horse, therefore sterile. A male mule can mate with a female mule, but will never get her pregnant.
Absalom2 Samuel 18:9And Absalom met the servants of David. And Absalom rode upon a mule, and the mule went under the thick boughs of a great oak, and his head caught hold of the oak, and he was taken up between the heaven and the earth; and the mule that was under him went away.
A male mule is always sterile, however , rarely, a female mule will be able to reproduce.
Geldings will do this sometimes when they are almost finished urinating. Mares usually like to stand in one place.
Horses, boats, & walking.
Walking can increase pressure on the bladder, which can stimulate the urge to urinate. This is because physical activity can cause the muscles around the bladder to contract, making you feel like you need to go to the bathroom.
First, I would ask what you mean by "hold in her urine". It is normal for a rat to urinate while walking sometimes or when you are holding them. My rats won't urinate in the bedding where they sleep, but they urinate all over everywhere else. i know it can be messy, but I just clean out their cages once a week and it's not much of a problem.
By walking, riding a horse, mule or camel, or a very tough vehicle.
yes it normal. You will have a bag where you can urinate. When it will be full you can empty to the toilet
A Donkey will struggle and it will start to sink, while a mule will remain calm and only partially stuck.
Yes, why wouldn't they be able to? Everyone can urinate while erect, it's just a little harder.
stress incontinence
Horse, mule, sled dogs, boat, train, buggy, stagecoach, & walking.
yes that is normal
Yes, but it's impractical and messy