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Myiasis caused by Cuterebridae is quite rare, though less rare than in other families of botflies. The larvae almost never make it past the first instar, so there is no way that these flies have been growing in dogs and pupate.
So, my advise would be: go to the vet if there are any complaints.
Start looking in and around the eyes, ears and possibly anus.
If there are no problems, you and your dogs are fine.

I would be surprise if the dogs turn out to be invested.

(By the way: Hematobia hominivorax from South America is a different story. This species can be found in many species of mammals).

Theo Zeegers