Simple answer... you lost your role as alpha... and in the confusion of the new mess, the dog has assumed that this new entity is making a show for it.
My 2 cents... anytime... ever... in any situation when you lose control of your dog... realize, and be ok with the fact that it is 100% your fault, deal with it, and move on.
New baby in the house means most of the pups old attention, whether it be behavior modification, or just hanging out, now has transferred to the baby. If you wish for the dog to remain well behaved... give the dog the attention it deserves, or be prepared for far worse than a few piss stains in the corner.
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“ I have the simplest tastes. I am always satisfied with the best.” -Oscar Wilde
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