Yes. And no.
Most of us will see something or become aware of a situation in our lifetime which we consider animal abuse, neglect or cruelty. The reality is that whether or not what we see is illegal is a different question entirely. Each state has state laws regarding animals, some of which are strong and some of which are not. Many municipalities have their own laws regarding treatment of animals and yet other municipalities rely on the state laws for standards. The only federal law related to animals is the Animal Welfare Act which was enacted in 1966 and which regulates the treatment of animals in research, exhibition, transport, and by dealers. The point is that what is illegal in one place may be perfectly legal in another place and there is little you can do about it. What you see may bother you and keep you up at night, but it is entirely possible that law enforcement authorities cannot do anything about it at all.
The same is true regarding animal crimes. If you see something you don’t like, you can submit an anonymous report in many areas of the country. But almost all of those places which allow for anonymous reporting also require the complaining party to testify if an actual criminal case moves forward. Only those people with first hand knowledge of the abuse, neglect or cruelty can provide evidence - in the form of testimony - in support of a criminal case. This responsibility cannot be passed along to a third party or to animal control personnel.
Other situations are not self-proving and require you to become personally involved. You may see something day after day which bothers you. A cat who is being physically abused by being kicked or thrown. A dog who never has water or who has no shelter. If authorities go out to check it, it is entirely likely the animal owner will either deny the allegations or will claim the situation just arose. The water just ran out. The shelter was there an hour ago. In some cases, authorities will have to have a search warrant to investigate abuse and neglect which has been issued by a judge as a result of a showing of probable cause. In many cases there is little authorities can do about the abuse, neglect or cruelty absent your willingness to speak up for the animals who cannot speak for themselves. You are the one who must break the he said/he said stalemate by reporting what you know, by being prepared to file a formal complaint, by being prepared to testify about what you know and perhaps even by providing photographs you took or video you have recorded (while doing so in a manner which does not amount to trespassing or harassment of the animal owner).
If you see something which bothers you so much that you loose sleep over it or you feel compelled to get involved, please be prepared to own your outrage. If you think the animal owner is approachable, try direct contact first. There may be circumstances going on of which you are not aware. If the person is not approachable and you really want something done by someone, remember that the someone is you. If you have time to complain about the situation on social media, you have time to channel your energy into positive action. Stand up for what you believe and speak for the sake of the animals who cannot speak for themselves. If you won’t do it, who will?
Other information on this topic is found on these pages here:
Animal Cruelty in Your State
Who to Contact and What to Report
Reporting Mills, Dog Fighting or Hoarding
Using Common Sense Regarding Animal Cruelty