My friends' dog whining?

I'm taking care of my friends dog for 5 days. my friend just left about 30 mins ago and hes still whining about it. i think its sad and cute and i dont mind him whining a bit, but i have 2 Qs:

1. Will he stop?

2. The whining sounds weird. After he finishes whining and he breathes heavily and he sounds like he has asthma or something. it concerns me a bit
 
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