Aries, your pup could be getting hungry about that time, I fed my Merlin as a pup Once in the AM as I got ready for work (about6) then at about 2 then again a small snack as we ate dinner about 6 pm then another small portion about 9 pm and always about 20 mintues after eating I took him out and told him to do his business, and waited til he did then lots of hugs. My neighbors thought I was nuts but only one accident ever and hes 4 years old now. they all have put their dogs out side in kennels. Sad just alittle love and they could have a nice in door compainon. Hope this helps and remember they only eats lots as pups after about 2 years watch that they don't over eat. too much weight is very hard on those large joints.
My newfie (gone now) lived til age 12 becouse I kept him active and lean,my vet was always pleased with his health.