This is all about powerful enticing odors — exuding and absorbing them. Attendant behaviors include edginess and short tempers. Odors are left anywhere, but especially on existing odors, such as where a dog has urinated. Odors are absorbed by wallowing in them and sniffing them.
Behaviorally, there is a decisive tentativeness during this time of year as a male and female approach each other. When HE comes over to sniff her, his movements are slow and as inoffensive to her as possible. The minute she shows any signs of flinching, he stops dead-still and waits for her to finish her reaction. He reads every detail of her movements. He is totally accommodating and ever so careful not to annoy.
For her part, she likes his presence — after all, she is walking with him. But she has let him know that he better watch himself — she appears ready to react to any misstep on his part. She rolls in his urine and allows his closeness — if he is careful. They read each other well. She’s been testy recently and he is absolutely walking on eggshells because of it.
I’ve numbered and annotated the 32 slides to explain what is going on in each one.