ESA on property before I received letter.

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Can you evict a tenant in a lease if they bring in a valid ESA animal after a lease is signed? The dog has been there for a few weeks and I just received the recommendation letter and also the letter from a licensed mental health professional in the area that has been seeing my tenant for over a year in a half.Papers stated my tenant has 3 mental Illnesses in the DSM. So it is valid. But do I have grounds to evict for this animal being there before I received the proper paperwork? They are great tenants. Been living there for 3 years, no damage, never a day late on rent or utilities . The only issue is them bringing in a puppy before giving me the paperwork. Is this grounds to evict? Everything I am reading seems to point to me being stuck because there’s no laws regarding when the animal can appear. It’s a 12lb Dog
so it’s not a huge breed or an “aggressive” breed. This is new territory for me. So I apologize in advance I know this has been asked over and over. Just wanting to see if there’s any updated laws out there regarding having the animal on property before I opened mail with paperwork. Thanks!