"I guess the washing of utensil licked by dogs ruling was also issued at the same time to make sure that the rabies virus does not spread.
So according to you now it is okay for people to eat in a dog’s plate without even washing it?
It is true that Prophet Muhammad(SAW) ordered killing of dogs in Madina then:
*Book 10, Number 3813: *
Abu Zubair heard Jabir b. 'Abdullah (Allah be pleased with him) saying: Allah’s Messenger (may peace be upon him) ordered us to kill dogs, and we carried out this order so much so that we also kill the dog coming with a woman from the desert. **Then Allah’s Apostle (may peace be upon him) forbade their killing. He (the Holy Prophet further) said:It is your duty the jet-black (dog) having two spots (on the eyes), for it is a devil. **
Ibn Mughaffal reported: Allah’s Messenger (may peace be upon him) ordered the killing of dogs and then said: what is the trouble with them (the people of Medina) ? How dogs are nuisance to them (the citizens of Medina) ? He then permitted keehing of dogs for hunting and (the protection of) herds. In the hadith transmitted on the authority of Yahya, he (the Holy Prophet) permitted the keeping of dogs for (the protection of) herds, for hunting and (the protection of) cultivated land.