Housebreaking Older Poodles

Question
We have wonderful 2 poodles:  a 10 year old miniature (male) and an 8 year old toy (female).  Up until about 7 months ago, they were perfectly housebroken and used a doggie door (to our fenced in backyard) to relieve themselves whenever they needed.  We never had accidents in the house.  Over the summer, however, our smaller dog developed a penchant for Bufo Toads and after 2 near death experiences, we shut the doggie door for good (we lost our fence in a hurricane to boot so it is not even an option for our bigger dog).  

Now that the dogs have lost their freedom to go out as they please, we find ourselves having to housetrain our older dogs and put them on our busy schedules.  On a daily basis there are accidents in our living room (thank goodness it is tile) despite the fact that the dogs are taken out twice in the morning (7:30 and again at 9:00), once in the afternoon (between 3:30 and 5:30) and once or twice in the evening, the last walk is usually around midnight.  Still, they routinely visit the living area in the middle of the night while we are sleeping so we are greeted with a mess to clean each morning.  They also have a lot of accidents in the early evening when we are getting our children ready for bed, and we don't know which dog is doing it (probably both).  Do you have any suggestions?  We have been walking them on or about this schedule for 7 months and still the accidents happen almost daily.  We are getting to wit's end!  Any advice you can offer would be great.  Thanks.

Answer
I hope those stupid toads never make is as far North as I live.  

It may be tough for for older dogs to adjust to, but I think you need to crate them when you can't watch them.  The dog may be
happier in its den than loose in the house.  It relaxes, it feels safe in its
den.  It rests, the body slows down reducing the need for water and relieving
its self.  Dogs that have been crated all along do very well.  Many of them
will rest in their crates even when the door is open.  I think the plastic
ones give the dog more of a safe, enclosed den feeling.  Metal ones can be put
in a corner or covered with something the dog can't pull in and chew.  Select
a crate just big enough for the full grown dog to stretch out in.

Leave it some toys.  Perhaps a Kong filled with peanut butter.  Don't leave
anything in the crate the dog might chew up.  It will do fine without even any
bedding.  You will come home to a safe dog and a house you can enjoy.

A dog that has not been crated since it was little, may take some work.
Start out just putting its toys and treats in the crate.  Praise it for going
in.  Feed it in the crate.  This is also an easy way to maintain order at
feeding time for more than one dog.