[HamiltonJay]

Again,

I have already ceded that environmental factors may exacerbate the disorder, but there is little doubt at this point that the underlying cause is genetic. I believe we won’t find one single “autism gene” per se, but will likely find that it is a combination of genetic markers in combination that lead to the disorder, as well as the extremely wide range of functional issues that come with it.

[AnAmericanMother]

I think we're agreeing in essentials, just varying on details.

Using dysplasia as an example, the condition is still there even in asymptomatic dogs (it shows up on Xray) but there are no symptoms.

Generations go by so much faster in dogs, you can see things developing more easily.