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Genetically, not necessarily.
However, in terms of life experience and learned behaviour yes the dam has much more influence on the pups than the sire just by virtue of association and direct interaction.
There's also a science called epigenetics. This is neither directly inherited DNA or environmental imprint. It's a combination of both things - certain genes can be switched "on" and "off" according to certain environmental influences.
In addition to this, trauma and experiences of any kind can permanently alter the DNA code and the new altered code will be the one the offspring inherit. Starvation for example has been shown to have an impact, 2 and 3 generations after the starvation event. When we talk about ancestral and collective trauma in certain human populations that have suffered, it's not just a psycho-social phenomenon, it's hardwired into their DNA.
And on top of that, as Meadowcat says, some studies have shown that what happens to a dam during her pregnancy as well as what she does has an influence on the offspring. For example there used to be an old saying from hunters that if you wanted good hunting dogs, you had to hunt with your bitch while she was pregnant. Well, studies have actually demonstrated that whatever activities the bitch does while she is pregnant, her offspring will be better at, than a bitch who has the same DNA and has been trained to do those same things, but didn't do anything while pregnant.
The health and fitness of the dame prior to breeding, during breeding, during whelp and afterwards also has an impact on the puppies. Too much negative stress experienced by a dam during that same period can permanently rase the cortisol levels in the puppies (cortisol is the stress hormone).
In a less direct manner, it stands to reason that the person raising the puppies will generally be whoever the dam is living with after breeding, or at the very least who she is living with after whelping. The environment this person provides will shape the early life experiences of those puppies.
So while the genetic contribution of a dam isn't necessarily more to the temperament, the dam (and thus the breeder) has a lot more to contribute, directly and indirectly than the sire does.
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