Nightline 5. Question. Are my teeth yellow . Have you tried the tissue test . Oh, yellow. What do you use . Crest whitestrips. Whiten 25 times better than a leading white ning toothpaste. I passed the tissue test. Crest whitestrips are the way to whiten. Tired of redosing antacids . Try duo fusion two in one antacid relief. In one chewable tablet. Try duo fusion from the makers of zantac. Number one in just 60 seconds. Good evening. Tonight see a side of americas bitter immigration debate you almost never get to see. We know about Donald Trumps plan to build a wall and president obamas stinging setback in the Supreme Court for his plan to offer legal status to millions of undocumented immigrants. What is largely out of view is the human drama and sheer danger of the journey so many people are attempting to make even as i speak tonight. Abcs matt gutman is in mexico on the migrant trail. This is the bridge over the river. Reporter the river that separates mexico and guatemala. This is the legal way to do it. If you have papers. Reporter at the bridge, the only official Border Crossing for miles. Were tracing the first and one of the most dangerous stretches of the migrant trail. Traveled mostly by Central Americans trying to escape the brutal Gang Violence back home. A few blocks from the bridge we meet edwin and jose. They come from el salvador, the murder capital of the world. Theyre beginning their second attempt to reach the u. S. The uncertain road ahead is more appealing than the horrors theyre leaving behind. He says the situation in el salvador is very bad. Violence, poverty. Theres nothing there. Like most Central Americans fleeing their homeland, they will cross into mexico illegally. No passports among the treasured belongings in those tiny backpacks. Jose wears his reason for flight on his back and his arms. He shows us the nickelsized scars from a shotgun blast. He says, thank god the gangs didnt kill me, because they tried. Thats why were the victims in this situation. We dont have any other options. If i go home, i could die. Crossing the river, edwin and jose both know that once in mexico, their journey will become much more treacherous. When migrants are smuggled across this river to mexico, theyre entering what human rights advocates call a death trap for them. Mexican authorities are sweeping up migrants in record numbers before they even reach the u. S. Most are deported. But mexico enforcing its own immigration laws more than ever has created another crisis. With bandits and human traffickers preying on migrants still looking for ways to get north. Edwin and jose disappear over the riverbank. And we rush through the legal crossing on that bridge to try and catch up with them. Traveling north through immigration checkpoint after checkpoint. Eventually reaching a nearby shelter, a churchrun safe haven for roadweary migrants. There we have a little chapel. Reporter father florigoni is a priest with a prophets beard and says were in the midst of a humanitarian crisis of biblical proportions. Children, women, and other people. Everybody is trying to get out. They come here. Sometimes with bullets still in their bodies. Asking just for a chance. Reporter thats why he describes most as refugees rather than migrants. Like carlos horkwho fled el salr with his wife and three small children. Carlos tells us families in el salvador are affected the most. His goal as a father is to keep his family safe. The shelter is crowded but father flor tells us less so than in years past. And no sign of edwin and jose. So wedrive towards riaga the southernmost stop for the freight trains that migrants calla bestia, the beast train. Its not an affectionate term, its a term coined because so many people get hurt, maimed, killed along this train. Its one of the ways so many of these migrants get extorted. Imagine climbing on this then while its moving. But it is still the most efficient way to get north. We spot this trio walking a trail by the railroad tracks. His name is luis and hes just 19 years old. Also from el salvador. He hasnt seen edwin or jose but has followed the same route almost 200 miles by foot. He leads us to a nearby shelter. You all speak a Little English . Reporter the winds of violence from further south also sweeping in this group of destitute teens. This is all we have but more cookies if you want. Reporter some extra cookies in our car helping to stave off their hunger. Are you afraid . Reporter and before theyre allowed inside, theyre frisked and searched. The shelter owners say its a necessary indignity to keep the shelters safe. Theyre all willing to withstand this, to undergo this, because they know this is the first time they can actually have a bed to sleep on and probably the last time for a very long while. Reporter its just a temporary reprieve. Migrants have only three days in most shelters. But even here, beyond the reach of immigration authorities and most gangs, not everyone feels safe. Even the people here you cant trust . You can trust nobody. I can trust me. But i cant trust that. Even your own shadow you cant trust. Reporter hes 22, asked us not to show his face because even here he fears retribution from the ms 13 gang. They beat you up, bashed up your elbow, took all your money, took your brandnew phone . Reporter hansels story is heartbreakingly common. According to the mexican government, threequarters of those who pass through this area will be assaulted. We continue looking for edwin and jose. Thats the pair we lost back at the border. After two days they finally responded to our texts. They tell us theyre hiding near the train tracks and our driver thinks he knows where they might be. Havent found anything. And our guys are nowhere in sight. Reporter after nearly an hour we just got a text from them that they were caught by Immigration Police and are in a van being taken somewhere. Reporter and in a sad glimpse into this unending cycle, a final text from jose. He and edwin are being deported. And jose tells us he and edwin will try the journey yet again. Back at the shelter we check in with the group from honduras who after settling in share a moment of ease. Hyena cackles and ribbing. Acting like the boys that they are. Its a brave facade that shows cracks during the shelters evening prayer. An uncertain future for them and their loved ones back home brings tears, too many for their hearts and their dirty sleeves to absorb. The boys the priests and sisters bless cant hold them back. When you were crying just now, what were you thinking about . Parents, family. Its hard. Do you think you may never see them again . Maybe, i dont know. Reporter we stayed in touch with them. Four making it to the u. S. The others sent back. And in many ways they defy the odds. Because after the prayers, i asked the priest how many he thought would make it. He says maybe 30 . Probably less. For nightline, im matt gutman, ariaga, mexico. Next, if youre pets got behavioral issues, should you put him or her on prozac . Millions of american pets are on antidepress ants. Why some people are questioning this trend. First, your voice, your vote. It was a day of headspinning development in the president ial race. Im fired up. Hillary got me fired up. President obama and hillary clinton, onetime rivals, today side by side for the first time in this race. There has never been any man or woman more qualified for this office than hillary clinton. That ringing endorsement coming just hours after an fbi investigation slammed clinton for using a personal email server during her time as secretary of state. A stinging rebuke. But no charges recommended. Although we did not find clear evidence that secretary clinton or her colleagues intended to violate laws governing the handling of classified information, there is evidence that they were extremely careless in their handling of very sensitive, highly classified information. An almost audible sigh of relief from the clinton camp but her likely opponents response swift and biting. Donald trump tweeting, the system is rigged. She went to extraordinary lengths to carry out an end run style purge of her emails. Like a criminal with a guilty conscience, clinton had her lawyers delete, destroy, and wipe away forever 30,000 emails. Trump tonight going so far as to imply that clinton bribed the attorney general. The attorney general is sitting there saying, if i get hillary off the hook im going to have four more years or eight more years. But if she loses im out of a job. Its a bribe. Its a disgrace. But earlier today, sleefves rolled up, the president throwing jabs of his own. 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Priorities usa action is responsible for the content of this advertising. Were taking another look at a new wrinkle in the debate over whether americans are overmedicating for what ails us psychologically. Not only ourselves and our children but also our pets. Heres abcs david wright. Reporter at the end of her work day, morgan hates to keep her partner waiting. Racing out the door, running to get the subway. Reporter its not so much that hes jealous, he just misses her more than he should. There is a part of me that feels guilty just because i know that when he gets stressed, he is very distraught. And its hard to watch. Reporter unconditional love isnt always healthy. Hi i know, i know i know, its okay reporter morgan accepts that about hatchi, a puppy who suffers from a very real, very human disorder, separation anxiety. Hatchi digs at the floor. And he digs at the door. He bites the molding. And this is really all in an effort to get out of the apartment. Reporter and like an anxious human, theres powerful medicine that can help. Thats right. This melancholy mutt is on doggy antidepress ants, a sort of prozac for puppies. Hatchi isnt alone. Nearly 3 million dog in the u. S. Are on antianxiety meds right now. Lets not even get into cats. The problem is just like with us, we often turn to the drugs as the first line of treating the problem. I think thats the mistake. Reporter researcher and writer laurel brakeman, author of animal madness, says our pets have deeper emotional lives than most of us give them credit for. What sort of emotional complexity is there for a dog . We like to think that the dog is wagging its tail because hes happy to see you when you come home. When part of you suspects maybe its because hes hungry. Were like that too, are we happy when we sit down in a restaurant because were about to eat or because were with good friends . Its safe to say other animals, particularly dogs, can be happy and sad and anxious and fearful. Reporter in a world of pampered pooches, wheres the line between compassionate concern and fullblown crazy . Its so exciting, look reporter in legally blonde, elle woods was a bit too present for her dog. You see a big blue ribbon reporter how about best in show . Go to the hotel and get busy bee this is albert sign einstein. Reporter for ann marie its not about pampering her pooch, shes worried about alberts Mental Health. I take him for a walk, hes so nervous. He looks right to left, his tail is down. Oh, yes, you can do it hell stop and freeze and be trembling very, very strongly. It makes you want to be able to give him a drink or something. Reporter after a series of failed behavioral treatments, albert was diagnosed with extreme anxiety. And the vet prescribed prozac. I knew that prozac really helped people. And i knew albert really needed help. Reporter but that diagnosis wasnt cheap. Therapies and treatment costing upwards of 5,000. In fact, consumers nationwide are estimated to spent more than 7 billion on pet meds every year. More than ever before. And were going to present him with our closed fist reporter hatchi is meeting with trainer erika. Hes like, thats what you were looking for, okay. Reporter prozac gives him that extra little help to succeed, according to his owners. You have to do the behavior modification, you have to be extremely diligent and dedicated, because prozacs not going to solve the problem. Hes just howling. Reporter morgan and jason show us hatchi in fullblown panic attack. Hes been alone five hours. Hes pacing. Now hes whining. So hes clearly stressed. Keeps going to the door. Reporter and this video, watch as hatchi opens the refrigerator door. Thats not half as bad as what he can get. And thats very stressful. Reporter we take it to dr. Brakeman. Hes howling even as he has his head in the refrigerator, poor thing. Heartbreaking, isnt it if. Heartbreaking, its so sad. He definitely has separation anxiety and perhaps he could benefit from medicine. Reporter preparation pad pet ownership isnt for everyone. This is a brainaltering medication. Thats a really scary thing. Do i want to alter my dogs brain . Yes, when it causes him so much fear and anxiety that he has to dig at a door and try to let himself out. Reporter at least for now the drugs are working for hatchi. Its tremendously helped. Prior to putting him on this medication, he could not be alone for more than two hours. Now the seven, eighthour mark. Reporter albert, while skittish, is finally able to make it around central park. Okay, all right reporter a spoonful of sugar and perhaps a dab of Peanut Butter helping the medicine go down, and helping the whole family relax. Im david wright for nightline in new york. Next, the american previously best known from reality tv now wowing at wimbledon. After beating the worlds best player, can sam querrey go all the way . What about serena and venus . Are we looking at a sibling rematch . Im billy, and i quit smoking with chantix. I decided to take chantix to shut everybody else up about me quitting smoking. I was going to give it a try, but i didnt really think it was going to really happen. After one week of chantix, i knew i could quit. Along with support, Chantix Varenicline is proven to help people quit smoking. Chantix definitely helped reduce my urge to smoke. Some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. Some had seizures while taking chantix. If you have any of these, stop chantix and call your doctor right away. Tell your doctor about any history of Mental Health problems, which could get worse or of seizures. Dont take chantix if youve had a serious allergic or skin reaction to it. If you have these, stop chantix and call your doctor right away as some can be lifethreatening. Tell your doctor if you have heart or blood vessel problems, or develop new or worse symptoms. Get medical help right away if you have symptoms of a heart attack or stroke. Decrease alcohol use while taking chantix. Use caution when driving or operating machinery. Most common sideaffect is nausea. Being a nonsmoker feels great. Ask your doctor if chantix is right for you. Trust number one doctor recommended dulcolax constipated . Use dulcolax tablets for gentle overnight relief suppositories for relief in minutes and stool softeners for comfortable relief of hard stools. Dulcolax, designed for dependable relief your heart loves omega3s. But theres a difference between the omega3s in fish oil and those in megared krill oil. Unlike fish oil, megared is easily absorbed by your body. Which makes your heart, well, megahappy. Happier still, megared is proven to increase omega3 levels in 30 days. Megared. The difference is easy to absorb. Have you tried the tissue test . Question, are my teeth yellow . Ugh, yellow. What do you use . Crest whitestrips crest 3d whitestrips whiten. 25 times better than a leading whitening toothpaste i passed the tissue test. Oh yeah. Crest whitestrips are the way to whiten finally here tonight, the fascinating questions looming over wimbledon. Can the littleknown american win the mens finals . Will the williams sisters once again go head to head . Heres abcs nick watton night. O say can you see sam querrey through to the last stage reporter smiling sam querrey, 66 san franciscan flaying a french man. Hes dispatched novak djokovic, world number one alltime great. Exciting match, it was something fun. I played really well, something ill always remember. Reporter he was previously best known for bad dancing on vine. Whats your celebrity crush . Taylor swift. Reporter and bravos celebrity matchmaker. If he wins he might have a date for the semis. I havent felt many nerves. Reporter serena survived a slip slip slip and threats to sue an umpire. What i say on the court, whether smashing my rackets or in the heat of the moment, i have no plans, no future of suing wimbledon. Venus williams back where she belongs at wimbledon reporter 36yearold venus