Strange things in the night

Strange things are about. We left our back sliding door open a few inches to let air circulate through the house last night. It’s finally warm here. Our back yard is fenced and gated and we thought impenetrable to intruders and large puppies, but we found out differently. We were awakened in the middle of the night, okay it was five AM but it was Saturday and we like to sleep in on Saturday. A large black dog (we do not own one or know anyone with one) was drinking noisily from the toilet. (YUM) He was scared and only too happy to be led outside. I opened the back gate and he was off. Within a minute he was around to our back yard again trying to jump through the opening in our fence where our garbage cans set. I moved the cans a little closer together and he could not or would not jump in again. He made some rather deep tracks through my raised bed garden but no other damage. Looked like a very young, maybe only a few months, Newfoundland Retriever. Sure was a good looking pup, someone must have paid a bunch for him.