I've been on the Eye a couple of times. Not been up the Shard yet.
There seems to be anti-pigeon netting and spikes everywhere, but they will still find places to roost and someone will feed them.
As for dogs I've heard that Paris has a lot. They introduced motorbikes with vacuum cleaners to deal with the poop.
Ah! that's a brilliant idea! I do remember the dog poop in Paris. I thought the dog owners were just not as considerate as the ones in London. Someone needs to send some of these vacuum bikes to some cities I know haha.