I personally only use real 3/4" thick hardwood flooring. All the benefits above in regards to the engineered flooring are correct, but when you walk on it it will feel fake. When you walk on real hardwood flooring it sounds solid. I have two small dogs and they run and play on our hardwoods all day and I have no problems with scratching. If you are talking pit bulls or german shepards then you may have a problem with the scratching.
One of the benefits of real hardwood is it most likely can be refinished 2-4 times depending on the quality of the materials used and the name of the brand. I primarily use Mirage or Mercier hardwood flooring and yes it is the most expensive, it is very durable.
A lot of the engineered flooring products are floating floors which to me means you are relying on the edge strips to hold everything in place. To me that is not strong or secure, however if you have large dogs in the home it will hold up better against scratches but will have the sound of not being solid when you walk on it with shoes, plus you most likely cannot refinish the engineered flooring more than once if at all because the actual hardwood veneer is very minimal as opposed to the hardwood veneer that is applied on real 3/4" hardwood which most often than not can be refinished 2-4 times.
Hope this helped you and good luck with your decision.
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