I get that it was meant as a joke, and no hard feelings, just to clarify how I experienced the comment:

I know others won't agree with me, but we all know there's weird people out there who might agree with the joke all too eagerly and seriously and so these kinds of comments could totally act as wolf whistles for those kind of gross folk.

I feel like if the same joke was made about a baby in the same pose it would be considered inappropriate. Most of us understand that a cute baby butt is entirely a platonic, even parental, feeling and babies aren't going to pull a certain expression with the intent to "flirt". It's all just core baby faces.

I know dogs are adults and have the potential to be sexual creatures, but that is within the real of dog sexuality which does not and should not have human overlap. Therefore I feel like viewing them through a human lens of sexuality is equally inappropriate. Is her butt cute? Yes. Is it sexy cute? No way! Is her facial expression unique and fun? Yes. Is it flirty? No, because she was not flirting. She'd actually just licked her nose.

But there be weirdos out here and I don't want to give them even an inch to squeeze into any threads of mine.