I don't assume you accept this criteria. It seems a likely explanation that "we" in general hold it, even though you and I as individuals may (or may not).

Human love is real because there are many members of the set of humans who can use language to communicate about it. Animal love is not real, because they cannot do the same and therefore the love they appear to express must merely be a programmed response.

An assumption is that whether the expression is a "programmed response" as opposed to an act of "free will" determines the "reality" of the love. Another assumption is that "programmed response" and "free will" are mutually exclusive.

There was a movie a few years back called A.I. that explored this idea. (I liked it, but I suspect most people would find it overly long and boring.)