Your pet receives a set amount of points depending on it's level and the loyalty it has toward you. If you tame a level 70 pet, you'll notice it may have negative points, such as -175 points. This is because the loyalty hasn't been built yet. As you increase the loyalty, you will notice they will receive more points. Once they hit max (lvl 6 loyalty - Best Friend), then your pet will have the max amount of points for it's level (as if you leveled it from lvl 1 to 70).
Wait for the pet to hit it's max loyalty, and train it.