My advice for owning studs.

I have owned Jrs, Lab, Lhasa and now 2 chi stud dogs.

Just to add to all the good advice above, always have good strong high sided pen, a tiny chi in season or the male will get out of of the best pens to get to each other.

Some studs will mark in the house no matter how well you train them.

Some ,males do not eat well when you have a girl in season so it can be a good idea to keep them in diffrent areas of house with doors closed so the boy can think about something else.

Also dont trust them, it only takes 5 seconds for a couple to tie. And the will tie either side of fences , stairs gates and pends if the bars are to wide.

Even if its your girl you want to mate with your dog dont just leave them to mate over and over again 2-3 times is enough, keep them separate in between.

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One chi is never enough.......anything your dog can do my chihuahuas can do better