We do believe Muhammad(saws) was carried to a heaven by a creature of some type. It was something Muhammad(saws) had never seen before and never saw again. We do not know what it was except it was sent by God(swt). No where did Muhammad(saws) call it a winged horse.
Dog Memory Span. To be able to make a somewhat complete analysis about the span of dog memory, it is important to differentiate between associative memory and real memory. It is said that if a dog does not have some sort of exterior stimulus that he is not able to think about or remember parks or places he has been in before. But as soon as dog hears his owner's voice, smells him or perceives his presence at a distance, his associative memory activates or comes to life.
In other words, they don't have the power of episodic memory, or the ability to remember particular events in the past. A dog can know how to respond to the command sit without having a memory of the specific event in which it learned that command. That's not all that's at work in the dog's brain to help it, for example, impeccably predict the arrival of its owner.