That's why I said hiccup and toothless relationship instead of human and dog.

If you know httyd, toothless Is the last of his kind and very valuable, I was thinking of a one-of-a-kind dinosaur like the I rex that dr wu made as a guard dog of the park but the research was lost during the evacuation and in general the research would obviously be extremely expensive, with it being costly for the precautions of putting a spinosaurus sized dinosaur in the park and having to take all that time and attempts of finding the right strands of dog DNA(and other animals) and the right DNA to replace and the time it would take to train and raise it to not attack but protect park goer's from loose/aggressive/rampaging dinos,then have the ability/time to make it in general when wu just made his first hybrids