I’m sorry this happened to you. If you can prove that your landlord intentionally made your dog sick, you can sue them for damages (for example, veterinary expenses). You can learn more about lawsuits based on intentional torts here.
What is sepsis? What protocols should nursing homes and elderly care facilities put in place to prevent sepsis? Nursing home negligence can play a role.
Bad faith insurance claims are no easier in Colorado than in other states, but case law has evolved so there is protection - learn more here before a lawsuit.