I'm curious about the wolf hybrids diet.Is it a possibility they can become overweight due to any lack of physical exercise and over eating, or are they just muscular period?

Wolf hybrids can grow a little 'padding', but they cannot get fat. The wolf hybrids are designed with a particular purpose in mind and obesity would detract to their function.

How was this done? Alterations to the metabolic pathways that make sure only the needed nutrients and calories are processed, the remainder is passed on.

The side effect and possibly benefit of this is that large (unnecessary) calorie intakes upsets the stomach, thus motivating the host not to do it again.

Very interesting and i suppose there is a that function is also tied together with to much or to little exercise. These hybrids truly fascinate me especially Vilkas and Volkov.

Vixapede; Just sliiiighly taller than that p.o
No really though, as, a tall vixapede, it's always nice to have some kind of reference to both how tall, and how wide you are in contrast to the average human.
Words are one thing, but visuals, quite handy <3.