AITAH for refusing to feed my roommate's dog?

My (27F) roommate (43M) rents out his extra bedroom to me for $1200, which I feel is kind of pricy for what it is, but I don't want to move again. Let's call him Doug. Doug has a medium sized older dog which he had already asked me to let out to potty every afternoon before he gets home, since I work from home, to which I said yes because I go downstairs to eat lunch anyways.

I watched Doug's dog for weeks while he was out of town, to which he paid me absolutely nothing. I never brought it up but it did irritate me a lot. I heavily keep to myself/my own room and follow all of his house rules to make sure there are minimal to no issues, but I think I just pissed him off.

Doug decided to switch from his 6am-3pm shift to 3pm-1am. Again, note that HE decided on that. Now he's asking me to feed his dog every evening, and I said no.

I'm in a relationship that's recently gotten more serious and I'm starting to see him/my family more since I moved back somewhat recently, so I told Doug that I may not be home in the evenings or even daytimes as much as I have been, so he might want to feed him around 10am and 2:30pm before he leaves for work. Doug then responds asking again if I can "just put some food out if I'm going out so he doesn't need to wait until 2am" and honestly it irritated me to the point where I just flat out told him that he's not my dog, and this is the reason I don't have a pet, so he should figure out what works for the dog per his schedule and that there's no reason the dog would need to wait until 2am to be fed. He hasn't responded and has since given me attitude in passing. AITA??