Bob GarverSpecial to Valley NewsIt is said that actors should never work with children or animals or they’ll be upstaged. It is most definitely true of star/co-director Channing Tatum in “Dog.” But the good news is that the dog is so great that there’s plenty of room for Tatum to shine under his canine co-star. There’s no shame in Tatum being No. 2 to this dog, just like there’s no shame in “Dog” being No. 2 to “Uncharted” at the domestic box office for the second weekend in a row. That movie had over $100 million more in its budget, plus a ton of other advantages. Though if I had my way, “Dog” would be the better performer of the two.Tatum stars – well, he’s the human star – as Briggs, a broken-down former Army Ranger. He suffers from post-traumat
