Q: Can the police receive an anonymous tip than bring a dog to smell around a condo without a warrant, To get a warrant?

A: 4th Amendment law is one of the most fact-dependent areas of law known. It's not possible to answer your question on the information provided. Can police bring a dog into your unit without consent, a warrant or an exception? No. Can they have a dog in a public area/common area of a larger complex where they have a legal right to be? Perhaps. K9 sniffs are not considered searches. You said "around" a condo. You should consult with a lawyer in a confidential setting.

A: If the police did not enter the condo unit with the dog, and remained in the common public areas surrounding the condo, perhaps that is OK, but it depends on what is considered the “curtilage” of the condo unit(s) (in a normal single family house the curtilage is typically the home’s yard). I cannot imagine any scenario where a positive dog reaction alone to the presence of drugs outside conjoined condo units would justify probable cause to support a warrant to search inside one of the units. But confidential informants whose detailed information, basis for their personal knowledge, and past accuracy in providing information all support their reliability, will be deemed reasonable to rely upon for most search warrants. But a lawyer would need to know all the facts underlying the probable cause determination. Notwithstanding that analysis, if a judge granted a search warrant and the police acted in good faith in reliance upon it, then whatever incriminating evidence found as a result will be allowed into evidence, even if the judge’s determination that probable cause supported the warrant might later be deemed erroneous.

A: I agree with both previous answers provided. Additionally, The United States Supreme Court has previously held that a K-9 performing a search on someone's porch entrance to the home without a warrant is considered a search in violation of the 4th Amendment. As mentioned previously, a common/ public area around the home in a larger complex could be considered legal depending on specific facts.