Sometimes dogs limp or appear to be limping on the paws opposite to the one that actually hurts. If you still can't find anything, you should probably consult your vet. I doubt it's related to getting fixed, but crazier things have happened.
Legal entities have the right to own property, the right to trade, the responsibility to repay debt, and the responsibility to account for themselves to regulators, taxation authorities, and owners according to rules specified in the relevant legislation.
Also note that businesses need an occupational business license regadless of the business structure, that is whether sole owner, LLC or corporation. Also, if the business has more than one member, or you will file a corporation, you will need a federal tax ID number. Finally, Starting a business fist step is to select the tax legal structure. 1. Sole proprietor, 2. Partnership, and 3. Corporation or Limited Liability Company.