Well if we'd really love animals, we wouldn't domesticate them or just keep them for food or in cages/captivity to look at. Pets are more like toys or crippled versions of once free and sometimes majestic animals. We "love" them, cause they make us feel good, but really we are just domesticating nature. And then we have the problem, that we get sick of them or don't control their population and then we throw them out and let them starve on the streets or kill them, cause they are not able to live on their own anymore. With domesticating animals, we destroy their natural way of living and give them a new habitat with our rules, but that also brings responsibility too few are willing to take. Should we kill street dogs or let them live in cramped shelters or let them starve and spread diseases on the streets or kill other free roaming species (Australia)? Do we have the right to keep chicken in batteries for eggs and meat or shoud they live free range not just for their better live, but also our health from consumption? As always most people are too short sighted and when their cat gets babies they don't want them and throw them in the trash. The thing is, humans made their morals, we would never be angry at an animal for abandoning its children, so we are applying our morals regarding animals upon us. Who would be angry against a predator leaving its prey half dead or killing their rival or eating something alive or laying their eggs inside of the creature for the next generation to feed up on inside until that creature dies? Are we angry at one animal for exterminating another species? Maybe animals would be better off not being pets, maybe it would just be the same. Or is it just because mankind does everything in bigger proportions than nature, that is the problem?
Note, I am just giving questions, things to think about. I might not be a pet lover, but I still think, that we should treat our domesticated animals the way, we would like to be treated, not just for their sakes, but also for our health. That includes birth/population control. And if you say "oh you just never had a pet, you don't know how it is", then I say to you, that I grew up with my sisters having pets, my friends and family having pets, spending vacations on farms and in the countryside and in general a lot of time with animals. I get along with them very well, I just don't care for having any.