A co worker of mine has always swore by Letting his females come into heat one time before getting them spayed.. He swears they are better dogs for it, he has had both ways. I personally don't know, but I have heard him say that a million times..
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Rhonda, Bailey, Josie and my angel Bella Rue'
"Until one has loved an animal, a part of one's soul remains unawakened."
~Anatole France~