Can in the sense that some places in the world do that (increasingly less often), but these social norms are somewhat codified into US law. In the US dog and cat meat are illegal. It's illegal to kill horses for meat in the US, but not illegal to ship them abroad to be killed for horse meat. (This loophole is being exploited actively by this administration to round up feral horses to be killed)

Pigs too are often pets for an increasing number of people. The distinction of able to be seen as a pet vs not is a line that is constantly moving, and who gets moral consideration is line that tends to shift with it