Is it fair?

My husband and I to both work, but he makes more so he obviously pay's for more. I still pay for thing's for our 4 animals just like he does. He fights me every time I as him to help me with our animals. He will feed them and take them potty here and there and does the litter box, but that's about it. I usually feed them, take them potty, clean up after them, play with them, bath them, clean the tanks, everything. I have tried to tell him that just because he pay's for the bigger part of the animals that doesn't mean he doesn't need to help me with them. Am I wrong for feeling this way?