I've had two dogs :
Golden Retriever – lovely to look at, trainable, but with a temper and after a few "incidents" we had him put down.
Black Labrador – ugly for a Lab, being long, large, and "rangy". But his temperament was everything that a Lab. stands for.
But, of these two, either the Lab was more intelligent, or he was downright lazy – and I don't know which. We could threaten to throw a ball, and the Golden would set off even though the ball hadn't left my hand. He would then bring it back to me. The Lab, on the other hand, had to be persuaded to fetch it, and he would only bring it back to about five yards away when he would then lie down and chew it. I had then to go to him to take the ball from him to throw again.
There was, however, a very strange situation when the Lab died. A few hours before his actual death, he came to me, which was unusual anyway, and when I pushed him away, he slunk off with his tail between his legs: it was so noticeably out of character that I stopped doing what I was doing, and looked at him wondering what was wrong. Later that evening, he got up and welcomed out son-in-law home which was something he never normally did, preferring instead to just lie there. Overnight he died. Since then, I have read about other people experiencing odd happenings just before their dog died. All in all, I now believe that some dogs know when their time has come and try to say goodbye.
I know the above sounds daft and illogical, and I would not have believed it myself prior to the above. I have to say that there was nothing like this when we had the Golden put down.
It does seem though, that there is more to dogs than we humans realise.
Peter G. Shaw