To prevent a bitch from breeding after she has gone astray, accidentally been bred, wash out the womb with a strong solution of alum and water, using the ordinary syringe with the female point adjusted. The sooner this is done after the act of coition the better. It will often prove successful, especially if the bitch is in the early stages of oestrum. A fairly strong solution of Condy's Fluid, with 5 gr. of sulphate of zinc to each ounce, has also been successfully employed.

Another, and very sure thing I have found is, as soon as they are loose, have syringe ready, filled with pure cider vinegar, say half a teacup, hold bitch's hind parts up and inject this in the vagina. The super-matazoa can not live in any acid solution. The injection should be quickly done, after they are apart.