I also have a clause that early termination for reasons within the tenant's control will mean they have to surrender 2.5 months of rent as a fee. 

Now, if the lease is month to month, landlord can raise rent at any time, but I'm assuming here this case is still referring to term lease.2) Probably not required, but not a bad idea providing notice to subletter too, just to avoid headaches in case tenant 1 doesn't forward to surrender.

Make the date of the notice is more than 30 days prior to end of lease (the date of letter matches postmark if you are mailing); make sure it has the specific address you are looking to be surrendered; the name of the tenant on the lease, the salutation of "Jane Smith and all other tenants"; the body of the letter should state the date the lease expires, the phrase "and all other premises associated with lease [this covers garages, storage units, parking spaces, etc).; then state that the notice is in compliance with Wisconsin State Statutes.

My plan right now is to tell them to surrender the dogs to a rescue organization or I'll evict.

Texas Property Code 93.005 states:(a) The landlord shall refund the security deposit to the tenant not later than the 60th day after the date the tenant surrenders the premises and provides notice to the landlord or the landlord’s agent of the tenant’s forwarding address under Section93.009.

If an ex had a business that sold $100k in goods one year but had $120k in expenses the court wouldn't order him to surrender a % of the $100k...he didn't actually make any money.

(c) If, during the third or subsequent year of a lease, or during any renewal after the expiration of two years of tenancy, the landlord requires the one month's rent escrow provided herein, upon termination of the lease, or on surrender and acceptance of the leasehold premises, the escrow funds together with interest shall be returned to the tenant in accordance with sections 511.2 and 512.

They get keys to their new place June 5th and plan on having the unit "move-in ready" and surrendering it by June 12.

This is how it reads: "All parties to this Note, including maker and any sureties, endorsers, or guarantors hereby waive protest, presentment, notice of dishonor, and notice of acceleration of maturity and agree to continue to remain bound for the payment of principle, interest and all other sums due under this Note and the Deed of Trust notwithstanding any change or changes by way of release, surrender, exchange, modification or substitution of any security for this Note or by way of any extension or extensions of time for the payment of principal and interest; and all such parties waive all and every kind of notice of such exchange or changes and agree that the same may be made without notice or consent of any of them."

--(a) Notwithstanding any other provision of this act or law, and if the deceased tenant is the sole tenant of the residential unit, the executor or administrator of the estate of a tenant who dies during the term of a residential lease shall have the option to terminate the lease upon fourteen days' written notice to the landlord on the later of:(1) the last day of the second calendar month that follows the calendar month in which the tenant died; or(2) upon surrender of the rental unit and removal of all of the tenant's personal property.