Yes, a dog can sleep comfortably in a Thundershirt. Thundershirts are designed to provide gentle pressure that can help calm anxious dogs, making it easier for them to relax and sleep.
You can buy a thunder shirt for a dog in a few places. You can try looking online.
They do work because on most dogs, applying pressure helps relieve anxiety and calm them down. The thundershirt gives your dog a gentle and constant hug, which helps your dog feel very relaxed.
Is there some sort of medical issue your dog has which requires diapers? If not then no, your dog doesn't need to have diapers on, it needs to be potty trained.
If he gave you permission ahead of time. If not then no you cannot. You must leave all of his/her worldly treasures in his/her pockets.
Just don't cry over it too often. Understand that all living things must die eventually, and this was the time for that dog to leave us.
loyalty
Yes, all the time. You want to keep your dog healthy all the time.
overnight for sleeping, apart from that they need a good sized dog run if you are not going to be there.the longest you would leave one in a dog run IMHO is no more than 10hours.they need loads of exercise so not a dog to get if you want to leave it alone in a run all the time.
yes a dog can become untrained because if you train a dog then leave if for a long period of time it will will forget hat you have learned it!!!!
What you're thinking of is a "ThunderShirt", designed to stimulate the dog's comfort sensation that they feel, much like human babies do, when swaddled or nestled close to their mother. Also can be effectivley used in stressful situations to help soothe and calm your dog. Helpful? ;)
Hold her so he can get her or leave them together and give it time.