<human>: I'll try to keep this short. As the title says, I live with a few people, two of which are a married couple that have a dog that's around a year old. I love dogs, but I haven't had one since I was a kid, so I don't know much about pet care/how much time is reasonable to be in a crate. But I feel like "Rover" is in his for an excessive amount of time

For example, today was a holiday so everyone was off work and at home. I know Rover was out for some time this morning, not sure how much, but I know for sure from noon on he was locked up for all but an ~hour of the rest of the day. Why? I'm not sure, since his owners were both home. Had I been here and they not I would have let him out, but since his owners were here I didn't feel like I was able to do that without stepping on their toes.

On normal days he's locked up for ~9 or so hours while they are at work/not home, ~9 while they are getting ready for bed/sleeping, and also ~1 to 2 hours when they just don't want to deal with him for whatever reason. So that leaves ~4 to 5 hours a day that Rover is not locked up. Again, I don't know much about owning a dog, but this seems cruel to me.

I'm not really sure what to do in this situation. I feel bad for Rover being caged so much. When I'm here and his owners aren't I let him out and play with him, but when they're here I don't feel like I can do that since he isn't my animal. Am I making this into an issue that doesn't exist? Does this constitute abuse or neglect and should bring it to the attention of someone? If so who? Should I just try talking to them about letting him out more often/for longer? Thoughts and opinions would be appreciated, thanks in advance.

Can you give me the gist of the text in a nutshell?
<bot>: My roommates leave their dog locked in his crate for, what I think is, an excessive amount of time. Not even letting him out when they're home sometimes. What should I do?