From seeing this, it just goes to show how over-treating ur pet can lead to many issues. in saying that, i have done some research on dogs and from what i have found out is that Bert may be a cross bred dog. Fox terriers even if over fed, will not grow to be this size. Take Ernie for example, he may be fatter than averaged sized Fox Terriers but is still same in length. therefor from my point of view, it is due to Bert being a cros bred dog that he is seen to be this oversized. in the end i just wish the very best for these two dogs and hope they reach their intended goal..