A cash-offer that can close from a bona-fide investor is much better than a finance offer (MHO).So... if the listing agent had a higher offer but if the seller "rejected it" then with all means no foul play... if the listing agent got a higher offer first...

No harm, no foul and the contract is not binding until it is fully executed into escrow, comoplete with the EMD.As far as pissing off any listing agents, your simple explanation should suffice and would not be uncommon in this market as most agents know that investors are making offers on multiple homes at once in hopes of landing one.Option 2: Vest your offers in a newly formed, no asset holding entity (LLC) and in the occassion of this example, you could wholesale the other two for some extra profit (assuming they are real deals)

What is one thing that can foul up a loan getting approved?

I think it would probably be less than a dog/cat, but I have no clue what kind of lasting damage/odors a hamster could cause.

I have pulled a lot of urine-stained/soaked carpets and I have never had a situation where the subfloors or joists were odor-damaged.

They are so porous they soak any moisture up and retaine the odor. 

Expect all locations of the California DMV to be as crowded and as foul smelling as the Southwest AirlinesTerminal at Los Angeles International Airport.

This exemption will be used for funds in real estate most likely if the states don't foul things up with their current suits.Starting a "portal" (funding platform) is a non-trivial task that will likely require over a hundred thousand dollars to do it correctly.  

Avoid products, materials, features that are one-off, rare, precious, difficult to repair or maintain, easily damaged by normal wear and tear, holds odors or filth.

@J Scott It could be an improper vent which is siphoning water out of the trap (that's why the odor would go away after running the water).