I have 2 jack russell dogs - 1 a dog and 1 a bitch -  the dog seem too small to mount the bitch and breeding doesnt look as though it is going to be successful.  Have you any tips as my partner is looking at bringing a larger dog in to mate with the bitch

you could always try putting a cusion behind the back legs of your bitch just to give the extra height

I used to use the yellow pages wrapped in a towel for my tiny Yorkie dog.
Sometimes he needed two he was so small.