Hi, we are driving down to Denia from Bilbao via Zaragoza in early January with 3 small dogs and wondered if there are any recommended motorway service stations on A68 and A23, thanks.

Most I have stopped at previously seem to be very small with a food, fuel and toilet facilities but no decent walking areas for the dogs.

I may be wrong, but I doubt you'll find much for your dogs. French stops are better thought out in my opinion.
Perhaps you'd do better on the Nacional N232 from Logroño to Zaragoza where you'll be more "in the countryside" as it were & stop somewhere convenient.
Sorry I can't be of more help.

thanks