Pets at Home Senior Complete. New recipe and shape.

I've always rated Pets at Home Large Breed Senior Complete.

Recently I've noticed that the kibbles are much smaller. Large breed food used to have large kibble. The colour is also different.

More importantly, since the change, my dog appears to have wind and appears to be panting exessively in the evenings!

The Ingredients on both the old bag and the new bag are exactly the same (despite the appearance). So what is going on?

Anyone noticed or can advise me please?