My dog, Gus, had a tick on him last night

Natural FLEA & TICK spray...my dogs have not had fleas all summer and I only used this spray once!!
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We recently adopted a 6 month old Australian Shepard/Heeler mix from a shelter. He is/was a sweet, high energy pup with a good appetite. However 2 days ago when I administered Nexgard to our two other dogs (they’ve been on it for almost a year with no issues) I also gave him a dose. We live in a highly wooded area and have already begun have issues with ticks this year. However today I’ve have noticed that our new pup seems to be experiencing lethargy, has had several diarrhea bowel movements and has very little appetite. I understand these are all possible effects of Nexgard (and he won’t be receiving it again) but my question is what/if anything can be done to help him while we’re waiting for the poison to leave his system? And does it take a full month for that to happen? Please help with any advice, I feel horrible for submitting the poor little guy to this!
We did that a few times with another dog. We had peppermint soap and the ticks indeed backed out.
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Thank you for providing all this information for us and answering our questions. I have a 3.5 year old poodle/schnauzer mix. I believe in using homeopathy and holistic methods whenever possible. I have been using Bug off garlic tablets from SpringTime plus a vibrational remedy called a Pet protector for about a year. We have not had but one tick and a few fleas in the past year. I went to my vet today and mentioned that we’ve have 3 ticks in the last week. After I told her I didn’t like putting all the poison of Frontline on him, she prescribed NexGard. I’m not sure how she thought this was less toxic! Now reading all about it here and how it works, I see no reason to expose my beloved dog to this simply for fear of Lyme disease. If I understand correctly, the ticks bite the dog then die after 24 hours of being attached. So how would this prevent exposure to Lyme? D It’s a small remnant of skin that may stick out after a dog had stitches that failed to close correctly.
Photo provided by FlickrFeb 10, 2014 - this is the first time my dog has had a tick on him and it caught me by surprise
Photo provided by FlickrFeb 21, 2017 - Blind Dog's Family Abandoned Him On Street — Because He Had Ticks ..
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I am sorry if this sounds really stupid, but I am concerned. Our dog slept on our bed last night (she rarely does) and this morning we noticed she had ticks. She slept mostly at the foot of the bed, and there was one tick on my foot. I quickly took it off so I didn't notice if it was alive or dead. She left a few on the sheets, my husband claims most of them were already dead (she has tick treatment but apparently its not working 100%). We shook off the sheets to wash them and there was also one right by my pillow. Is this something I should be worried about? Should I call/email my OB? Any other advice is appreciated. Obviously she won't be sleeping with us for a lonnnng time again!Check your skin but you are probably OK unlike fleas, ticks don't hop from one host to the next. They pretty much find food and stay until they grow big and nasty. Have your hubby check the dog for more. They like to hide around the ears. As far as prevention I have only ever had luck with frontline and advantax.I am sorry if this sounds really stupid, but I am concerned. Our dog slept on our bed last night (she rarely does) and this morning we noticed she had ticks. She slept mostly at the foot of the bed, and there was one tick on my foot. I quickly took it off so I didn't notice if it was alive or dead. She left a few on the sheets, my husband claims most of them were already dead (she has tick treatment but apparently its not working 100%). We shook off the sheets to wash them and there was also one right by my pillow. Is this something I should be worried about? Should I call/email my OB? Any other advice is appreciated. Obviously she won't be sleeping with us for a lonnnng time again!We had a tick infestation when I first became pregnant. The main outbreak was next to my side of the bed, because that's where my dog slept. We stopped sleeping in the room, and got the dog out of there too. The vet gave him Certifect (the blue one), and the ticks were dropping off of him dead (we also pulled about 100 out of his body with tweezers -- yes, you must get the head, and swab dog with alcohol after.)