First of all, according to the fact that birds can talk and cats can read, we can guess that dogs can understand the words of their masters.

Secondly, apart from the dead hostess, only the male host can think, so the murderer is the male host.

Because cats can read, we can guess that the previous light was because cats were reading in the library.

What the host said is: No matter what you want to eat, I will always wait for you here in the flowers by the lake. Others may think this is boring, but after the dog understands it, he will go to lace at 2: in the morning. At this time, the male owner will put a piece of meat in the flowers, pull the meat with a rope, and let the dog bite.

On the day of the crime, the male owner killed the cat in advance and put it on the ground by the window of the library pavilion. He also broke the lamp so that it couldn't shine. He sprinkled the ground with small yellow flowers picked before, arranged it as a lakeside scene, and ambushed two dogs in the dark. Because of the alibi, it must be a weekend party and there must be someone else.

at 8: pm, the hostess saw that there was no light in the library, so she went to see it. When she went in, she found the body of the cat, so she picked it up and looked at it. This scene is just like the scene when the male owner trains the dog at ordinary times, so the ambushed dog pounced on the hostess, smashed the glass, fell to the first floor and bit it to death. At this time, because of entertaining guests, the male host was playing the piano. Because of his poor skills and the sound of broken glass, he heard strange sounds. At this time, the crow on the second floor shouted, "The dogs killed her!" (Because the crow flies away from the second floor, the crow is on the second floor) Because of the sound of broken glass, it sounds like: "Kill her!" Kill her. Then he called, "She's in the library." In order not to be suspected, but also to confirm whether the hostess is dead, the man rushed to the library. At this time, the third dog learned to howl outside (because he was in the forest, so he could learn) and summoned the other two dogs to the depths of the forest. When the host ran out of the house, he found the scene in the problem.

As for the painting, it may be a hint, or it may be the owner's motive to kill. Someone will come to this hut in the forest on purpose, or it may be because of this painting. At this point, the puzzle should have been solved.