I love to see like a frog and fox that change by temperature a small change on texture are big impact in the game of Minecraft I know many player love to see a changes on animal and mob.
1.)Mob are getting a mad on there body when they gotting contact in mad and bin washed away when they swim on a water like madded pig in earth Minecraft you can use that texture and the pet that always stay at home player are making an adventure to see that interaction.
2.) Pet are becameing fat over time when they sit Minecraft week eating and became weight less when they are not eating in a week when sitting because I see all player are leave there pet in there house alone to make them not alone make them weak on fighting other mob.
When they walked overtime they become energetic and have more powerful than a pet that who always set and don't interact in the wild that are the them on wild update.
3.)make a new achievement that tell them "they see everything fold on there too eye" to achieve this achievement breed fox on snowy area and transfer the toddpul on 3 temperature and seeing there pet all transportation fat, weight less,energetic or muscular and any evolutions in the future of animal good or bad it's not counted the mob
This is sounded like a mod but ever fixture new ni Minecraft are like a mod when they added but overtime they become part of Minecraft.
Minecraft community I know you love those suggestions spread this so that Minecraft recognize this feedback