Do you have to finish all quests before they refresh? I have open quests require a unicorn with scholar and a clever (44) gryphon with high intuition (39). I have no unicorns and one gryphon that doesn't meet the criteria.Those quests haven't changed for the 2 days I've been playing. 

Can quests keep your pet?  There is a 100 coin quest that says Famous artist is looking for a pet.  I put in an adoptee from the pound, because I don't know if I'll get it back.

I don't have any 500 coin quests now, just 2 I can't do and 2 for 100 coins.  

Its random, it should refresh daily regardless of how many quests are completed

U will get your pet back dw :)

Sometimes the quests look for certain genes or geneders, these are higher payed for than most, they will also give u items (random chance)

There is a quest asking for a  tough (43) Symurgh

What does tough mean?  more HP, more defense, more attack?

And is there a post that gives translations for words like this?