Hi millie,
the situation you told here, has not necessarily to do with sexual motivation.
At first the owner of the male lab should go to the vet to check the blood picture of testosteron. But I guess this will be ok.
What you should know is that a dog to the 14 th week is called puppy, at the age of 9 month a dog is declared as an adult dog, so we can not really speak of a puppy in your case because the lab is a year old.
What he is trying to show is that your bitch is his belonging, his ressource.
This explains his barking at other dogs the next day. The first day he had success in his behaviour and he had to make his stand point clear to others the following day. I'm sure he waged his tail a lot in this situations.
You can hardly stop this behaviour, when only curing the symptom, because the dog needs to find e ventil to regulate the pressure that arises by training this way.
The question is: why has he got the oppinion that something or someone is his own? Why is it possible for him to control things and what is he already controlling. Then you have to take everything away of what he thinks he has the control or his ressource is.
It would not be very successful just to keep him away from your dog, because if he makes the experience that everything else belongs to him, he can not learn for the future that all around him is its owners property.
So he must start to test every day again and aigain, to whom your bitch belonges.
How does he behave at home?
I guess he is pulling at the leash, he marks often and follows his owner in the house, whereever she goes, maybe barks, when visitors enter the house.
LG
gs
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Help with over sex male pup 
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