<human>: Can you give me the gist of the text in a nutshell?

So we got a dog 2 weeks ago. We live in a 2br apartment. We both work 9-5 M-F. 

After discovering that our dog (still a puppy, but close to being an adult) chews things, climbs on things, and requires tons of walking (meaning coming home from work during lunch, and waking up early in the morning), it's apparent that my SO is very short tempered with the dog.

He has told me that he resents her for her behavior and wants to take her back to the shelter.

We previously had a cat that he dealt fine with because cats are - in comparison - incredibly low maintenance.

The way he feels about the dog is upsetting to me. He's talked about children before and I can't help but feel like he couldn't deal with a child if a dog makes him behave this way. This behavior seems childish.
And before I go running my mouth about it to him, I want some people here to set me straight.

**** He NEVER hits or kicks the dog. I'm not talking about an abuser here. He just yells at her a lot and gets a little rough when yanking her off/away from things with her collar.

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QUESTIONS:

1. In your experience, does the way a person treats their animals reflect on how they treat people? Is it fair of me to assume he won't deal well with children?

2. Have you ever had an experience where you resented a high-maintenance animal but eventually grew to love it? How long did that take you?

3. Have you ever had experience with someone not treating an animal well? How did that relationship work out?
<bot>: My SO doesn't love our dog because she's difficult to care for (as puppies are). Is it fair of me to assume he'd behave similarly if we had kids in the future?