According to the World Animal Protection Index (
https://api.worldanimalprotection.org/ ) the only countries in Europe with worse animal protection indices in Europe than the US are Belarus, Turkey and The Ukraine, none of which are in the EU. There are only four 'class A' countries - UK, New Zealand, Austria and Switzerland with Austria being the highest.
I notice that the motion to transfer Article 13 of the Lisbon Treaty which covers animal sentience in to the Brexit Bill was voted down. Hopefully, there will be a separate bill or we will be slipping down that index.