this is "nightline." >> tonight, political stumble. dramatic video showing hillary clinton nearly falling. the election fallout from her diagnosis. new questions about her transparency and donald trump's surprising reaction to her disclosure. and his heated response to her attack on his supporters. >> she divides people as though they were objects. plus pudgy pets. is your dog big-boned? this animal weight loss camp will get your pet panting. the four-legged fitness industry now offering dog yoga, swimming, and digital fitness tracking. and with private chefs and playground equipment, your happy

stage fright. a chilling interruption during tonight's "dancing with the stars" premiere. >> excuse me! hey, back off! >> two men crashing the dance floor towards olympic gold medalist ryan lochte. tackled and removed by security. lochte's reaction and the video. but first the "nightline 5." ? >> take on any road with intuitive all-wheel drive. get 0% apr for 72 months plus $500 bonus cash. >> number one in just 60

good evening. thanks for joining us. hillary clinton facing political backlash tonight over what's being called her lack of transparency after revealing her previously undisclosed pneumonia diagnosis. this after weeks of the clinton camp dismissing concerns about her health as conspiracy theories. here's abc's david wright on how this will impact the election. >> reporter: it's not just the fact that she stumbled or worse that makes this the news worthy. consider the time and place. ground zero on the 15th anniversary of 9/11. hillary clinton and donald trump both there to project strength and resolve after the worst terror attack ever on american soil. an attack that hit close to home for both of them. the world is watching. so for clinton to abruptly leave

collapse, that's bound to be a very big deal. >> new questions tonight about hillary clinton's health. >> moments ago because of some apparent medical episode -- >> i just didn't think it was going to be that big a deal. >> reporter: tonight clinton called in to "anderson cooper" to clear things up. >> a lot of folks are worried about you, how are you feeling? >> thank you, anderson, i'm feeling so much better. and gotten some rest sooner. i probably would have been better off if i'd just pulled down my schedule on friday. >> reporter: but the damage was done. after clinton left ground zero it took her aides 90 minutes to issue a statement that she felt overheated during the ceremony and decided to head over to her daughter chelsea's manhattan apartment. less than an hour after that, she emerged, still in sunglasses, but all smiles, ignoring reporters' questions as though nothing had happened. >> how are you feeling,

>> great, great! >> what happened? >> it's a beautiful day in new york. >> reporter: she even becaused to hug a little girl who ran up to greet her. then she cheerfully said her good-byes and zoomed home for the rest of the day. five hours later, another statement. this time from her doctor, revealing that she was diagnosed friday with pneumonia. >> now knowing that she has pneumonia, should she be hugging that child in the street? >> yeah, there are so many di some of them are contagious, most of them are not. >> reporter: even so, today senator chuck schumer, who stood next to her at ground zero, said he now has pneumonia. the campaign said a number of staffers have been stricken. the bug going around. clinton now following her doctor's orders cut back on her schedule. and tweeted tonight, like anyone who's ever been homesick from work, i'm just anxious to get back out there. see you on the trail soon.

>> reporter: today donald trump appeared to take clinton at her word. >> i just hope she gets well and gets back on the trail. and we'll be seeing here at the debate. >> reporter: but for weeks now his campaign has been sowing doubts about her physical stamina. >> she doesn't have the strength or the stamina to make america great again. believe me. >> reporter: citing her persistent cough that flared up again a week ago -- >> every time i think about trump, i get allergic. >> reporter: today, given her campaign's shifting stories, some tough love from a fellow democrat. former obama strategist david axelrod tweeted, antibiotics can take care of pneumonia, what's the clear for an unhealthy penchant for privacy that repeatedly creates unnecessary problems? >> i think it's clear that the

the shafallout has been questio about transparency, honesty, trustworthiness. >> reporter: the good news for clinton is the health scare has taken focus off a comment she made friday night at a fund-raiser. >> you could put half of trump's supporters into what i call the basket of deplorables. the racist, sexist, homophobic, xenopho xenophobic, islam phobic, you name it. >> you cannot run for president if you have such contempt in your heart for the america voter. and she does. >> reporter: but it's the health care issue now taking center stage. and not in the policy sense. clinton has a history of being less than forthcoming on this issue. in 2012, when she was secretary of state, clinton fainted at home while suffering from a stomach bug, banging her head and suffering what aides first described as a minor concussion. months later at a benghazi hearing, reporters noticed she was wearing fresnal prison glasses designed to correct

only then did her aides revise their earlier disclosure admitting that the concussion was much more serious than they had previously admitted. speaking with diane sawyer in 2014, clinton denied lasting damage. >> no lingering effects? >> no lingering effects. >> of any kind? >> nope, nope. >> reporter: but republicans have had a field day. gop strategist karl rove among the first to suggest clinton had suffered some sort of traumatic brain injury. >> this will be an issue in 2016 race, whether she likes it or not. ? we came, we saw ? >> reporter: others have taken it further. >> what on earth could be the reason behind hillary clinton's bizarre behavior in recent weeks? >> reporter: this viral video, for instance, suggests everything from seizures to stds. >> hillary on the verge of a mental breakdown due to stress. >> i think the armchair diagnosis, looking at a video and saying, oh, does this mean

does this mean the person has a seizure disorder? does this have -- do they have a neurological problem? i think that's nuts. but it's not going to stop people from doing it. >> reporter: neither candidate has released full results from a physical. both put out short notes from their doctors. both now promise a more detailed disclosure sometime later this week. >> personally, as a voter, i'd like to know that a candidate is overall fit to be president. that they don't have a condition that will impair their ability to carry as a medical professional, i know that there are conditions people could have that will not have any bearing on that that they may not want to share with the public. i think that's people's right to keep that information private. >> reporter: there's a rich history of presidential candidates concealing significant medical problems. most americans had no idea fdr was confined to a wheelchair, thanks to a complicit press corps who agreed to play down

jfk suffered from addison's disease, which can have impact on the body's response to stress. and ronald reagan's alzheimer's did not become public knowledge until well after he left office. >> these are things that may have affect theed the elections. should the public have known? i don't know. >> it makes vice presidential vetting that much more important. >> it does make that more important. >> hillary clinton is the most qualified person to run as president -- >> reporter: tonight tim kaine prayed for clinton's speedy recovery. but questions about her health are all the more serious because of her lack of transparency. >> these questions about hillary clinton's health and stamina were on the dark reaches of the conspiracy theory internet and now is front and center in the campaign. >> reporter: ironically, hillary clinton has been talking for years about stumbling. >> when you're knocked down, get right back up. >> reporter: in fact, stumbling and getting back up again those to the heart what was she says would make her a good president. >> it's not whether you get

whether you get back up. >> reporter: after this episode, that challenge is now suddenly literal. i'm david wright for "nightline" in new york. up next, he ain't heavy, he's my bulldog. why some pet owners are sending their furry friends to fat camp. later, a security scare at tonight's "dancing with the stars" with infamous olympian ryan lochte on the dance floor. s back at red lobster. that means you get to try as much as you want... ...of whatever flavors are calling your name. seriously. like new garlic sriracha-grilled shrimp. it's a little spice... ...a little sizzle... ...and a lot just right. and try new parmesan peppercorn shrimp. helloooo crispy goodness. and the classic... ...handcrafted shrimp scampi... ...you can't get enough of? still gonna floor you. it may be called endless...

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do you have a chubby chihuahua? a husky husky? you're not alone. pet obesity is on the rise. more and more, americans are sending their animals to camps to help them to go from fat to fit. here's abc's nick watt. >> it's the only place that i would even consider sending her to. >> reporter: lisa is taking little aggie to summer camp in new jersey. but aggie isn't a kid, aggie is a golden retriever puppy. if i was being the animal in fat camp. >> people have said, it's just a dog, why are you going to that extreme? and i'm like, because she's part of the family and i want her to be healthy and happy. she's got the play package. she'll be outside doing all the different dog runs. she'll be out on the nature walk. >> reporter: we'll check back in with aggie, apparently lazy, in just a minute. but turns out lisa is far from

we will spend $15 billion this year alone on our pets' health. >> who's excited to be here? >> reporter: in my hometown, los angeles, pet health is exploding. doggie cross fit. >> try to keep that butt steady, low to the ground! >> the dog's doing nothing. >> reporter: yoga. >> pretty impressive, huh? >> reporter: it's to get yoga. >> it's been very powerful for both me and peanut she has allergies and a little anxiety and everything that breathes can use healing. >> reporter: must confess, the experience is rather lovely. >> just take your right hand up and over. and stretch. >> look at me. >> a little bit wobbly. >> reporter: sue cheffing at a beverly hills eatery. >> what's in the sauce? a savory sauce? >> it's a secret. >> reporter: choice of lamb or

i smeared that sauce. fish skin garnish. >> this looks lovely but the dogs are just going to scarf. >> reporter: it's not for lunching ladies. the bar here is in the vanguard. >> compliments to the chef. good, bad? a little too much sauce? your table manners are pretty atrocious. >> grain free is a popular trend right now. gluten free. gmos. it's a lot of how you're eating and putting in your own body. pet nutrition is a global conversation piece. >> reporter: because more than half of our dogs and cats are, in fact, overweight or obese. >> this is a yogurt icing. a little peanut butter gnash. >> reporter: doggy dessert. >> have a taste if you like. very edible. >> a little dog foodie. not bad. >> that's the philosophy is if it's good enough for you, it should be good enough for your pet. >> what's bad yore you is bad for your pet?

>> reporter: upstairs they're burning it off. >> this is a pet lifestyle center. >> pet lifestyle center? >> correct. definitely ahead of the curve in setting trends. >> reporter: they're all eating right. exercising right. feeling good about themselves. and --py want to say, ridiculous. but it's kind of beautiful. >> it is beautiful. they're very well made. >> reporter: yes, there's a catwalk. >> what is romeo wearing? >> romeo has on a harness that is leather. a little gold matte mesh. >> do you like your vest? does it make you feel good about yourself? >> reporter: put in the hours at the gym, eating right, you deserve it. flaunt it, romeo, flaunt it. we will spend $60 billion total on our bets this. >> pets this year, up 75% from the year 2000. meanwhile, back at the morris animal inn in new jersey, which

a day's treatment and a night's stay. turns out aggie really is a little lazy. >> dogs need exercise. they need to stay active. in order to be healthy. so they're not destructive at home. >> reporter: and aggie's a nervous swimmer. needs a life vest. and there's an aqua agility test at the end of the week. will she pass? is all this really necessary? >> pet owners, they're very busy. i know a lot of us work. it's very hard sure that their dogs get the exercise that they need. it's very important. because you want them to live a long life. >> reporter: you know those wrist bands, fit bits that tell humans how active they're being? max kruger has one. >> i wound up losing around 50 pounds. >> reporter: yep. now they exist for pooches too. and max's little pal tucker wears one. >> when it came out, probably 12 or 14 of my friends sent me the link. and i'm like, look, i already

cool. >> reporter: help max bust the dog walker for slacking off. >> tucker was supposed to be out a whole hour at a time. his activity tracker were register he'd been moving for maybe 10 minutes. so we looked into getting another walker. >> reporter: back in jersey, aggie -- sans life vest -- aced the swimming test. >> now she's jumping off the side, she doesn't need a life jacket at all. and she has impressed us all. >> reporter: lisa is here to take her home. >> i'm going to go give her a big hug and kiss. >> are you excited to see her? >> so excited to see her. oh my goodness! hi, sweetie! oh my goodness! >> she loved her treadmill. >> she loved the treadmill? >> reporter: does anyone really love the treadmill? really? i'm nick watt for "nightline" in beverly hills. >> mwah!

remember, real wheatons have curves. "dancing with the stars" topsy toursy tonight. an alarming incident puts ryan lochte at risk. i'm claudine and i quit smoking with chantix. by the time i was 30, i said "that's it, i'm a smoker for life." i wanted to be a non-smoker and i did it thanks to chantix. along with support, chantix (varenicline) is proven to help people quit smoking. chantix reduced 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. don't take chantix if you've 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 life-threatening.

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earlier tonight, olympic gold medalist ryan lochte trying to move on from his notorious incident in rio is catching his breath tonight after an ugly encounter on "dancing with the stars." on tonight's season premiere of "dancing lights, cameras -- and a whole lot of action. ? >> excuse me! hey, back off! >> reporter: while carrie ann was critiquing controversial olympic swimmer ryan lochte -- >> excuse me! >> reporter: two unauthorized men wearing anti-lochte shirts walked onstage. the cameras stayed on inaba's

off-screen. lochte and cheryl burke appear shaken and host tom bergeron segues to commercial break. >> we'll take a break, we've got the rest of the judges' comments, take a deep breath, we'll be right back. >> reporter: what the television audience didn't see is the protesters being tackled by security. >> excuse me! >> reporter: video of the incident was released by "dancing with the stars" after the show. >> i honestly don't know what happened. we were talking about it, we thought it was a joke. >> reporter: the two protesters seen here in handcuffs telling abc news they were upset because they believed he'd endangered americans with his disputed claims of being robbed at gunpoint in rio. according to the lapd, they were arrested and are facing misdemeanor charges of trespassing. after the show, lochte says he's focusing on the future. >> i came out here and i changed and i want to become a better person. i came out here, i did something totally different.