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I asked my vet about that (she runs her dogs in agility and belongs to the same club I do.) She said that she doesn't recommend a new boy where there's already a boy in the house, because of the testosterone issues . . . but that with an established girl it doesn't seem to make much difference.

I have a retriever club friend who has three Labs - all girls. One is the daughter of one of the others. They all get on fine, and the girl who's in active field work gets along fine with Shelley.

What's your experience with boys versus girls?

My experience really is that any dog with an average temper can be made to get along just fine with any addition of average temper, but that older females typically get along with a male (who will suck up to her) better than they would another female in the house. They'll be less competitive... less curled lips over preferred sleeping arrangements :~D.

Likewise, My male was pretty strong in the testosterone, but he was made to get along just fine with the other male lab I showed with, we spent too much time together to have it otherwise.

If you're going to spay/neuter it makes less difference, but much as intact males can be challenging for their attention, at least they're consistent.... I wouldn't try to compete in sport with an intact female for anything... they're too worthless when in heat :~).