Late one night an old lady rings her vet and asks the best way to separate two mating dogs.
"Try prising them apart with a stick," says the vet.
A few minutes later the old lady rings again. The stick hasn't worked and she asks if he can suggest something else.
"Oh, I dunno," says the vet, "Chuck some water over them."
A few minutes later she is back on the phone, The water hasn't worked and is there anything else she can try.
The irritated vet says, "Go and tell one of the dogs its wanted on the phone."
"Will that work?" asks the old lady.
" Well," the vet replied, "its already worked three times with me."