Bone Identification Help

[Zesus]

Hey guys and gals, 

 

While this isn't a fossil, I was wondering, if any of you had the time, could you help me ID this bone, as many of you are good at that sort of thing and I am clueless. 

 

Found in Menlo Park, CA. Still doing yard work when I have time and I came across this. Thanks for your help in advance! Hope everyones having a good day. 

[Wolf89]

 Please include a scale in the pictures

[Zesus]

Also while Im at it I found this as well. Much older, polished and seems to have been cleanly cut 

[Zesus]

Sorry, here is the scale from the first one. 

 

[Innocentx]

Dog? Not the sawed bone, the paler one. I think the sawed one is bovine as in somebody likes their steaks cut thick.

[Zesus]

Thanks! Dog was my first thought. There was one previous owner to this land and I guess I stumbled upon his dog