Effects don't work on wolves,commands and potions don't seem to work

I wanted to give my dog(wolf) the strength effect by using command blocks,and I tried the chat commands too,I tried to give it strength level 255(max),it gave it the effect and I saw the bubbles,but when I hit a mob to make the dog kill it,it didn't one hit kill it as supposed,I tried different levels for the effect,I tried the level 2 strength potion too and it had no effect either,I told you how to activate the bug and what was supposed to happen and what actually happened,if there is info missing ask me about it and I'll gladly tell you👍