Our expert says:
The chattering of the teeth is reminiscent of behaviour shown by males when there is a bitch in season close by. Sinc eyour other female is in season it could be her scent that is causing this. Just persevere carefully with the introductions. The other female's behaviour is that of a dog feeling neglected. Does the puppy sleep with you now?
Parvo virus is very "resistant"a nd you can carry it home on your shoes. It is best to have them vaccinated because if they get the disease t can be fatal.
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