When I applied, I had lived on a farm for a decade as a youth. I spent a minimum of 90 minutes a day doing farm chores, at least 50 weeks a year. I realized that made the number astronomical, and I already had a lot of animal experience hours. So I noted it on the program, and put 100 hours, then put an explanation that I did daily farm chores, what they were, and for how many days/yr and how many years. I did include additional hours under other subject headings like dog obedience competition, and livestock showing, but those were certainly in addition to that 1.5 hours a day minimum. But I didn't want anyone to think I was padding hours. I had a couple of adcoms on review say they noted the discrepancy in length (10+ yrs) and the hours and looked closer at the explanation and thought that was a reasonable way to handle it. I did not include the general pet care because it could easily seem fluffed or inflated. Right now, in vet school, I have 7 dogs and 2 cats, and if I really need to, I can tend to all of them in less than half an hour a day, so when folks have a couple of pets and are chalking up major hours on care, I tend to wonder if what they are defining as care is different than actual husbandry.
I do think if you have an unusual situation that you want to address (ie care for a pet that is above and beyond normal, living in a home that does pet boarding, growing up with assisting a parent dog groomer) it is possible to put it up with a good explanation, but if you really have a ton of hours in it, it may be better to thin it out. I am sure some will disagree.