Be aware the purpose of crate training a dog is because dogs do not eliminate in the same area they sleep. Unfortunately pet store puppies...have had no other choice....so it's not going to be real effective with him.
Letting him out 3 x a day wasn't often enough either. He is very small....very small means very small bladder too.
I would buy an x pen and set it up somewhere in the house. Include a pee pad inside...his toys, bedding...etc.
When you are home...do not allow him to roam unattended. Keep him confined where you can see him.
If it's possible to come home at lunch...I'd do that..or perhaps have a neighbor come in at lunch time.
__________________ Deb, Reese, Reggie, Frazier, Libby, Sidney, & Bodie |