url

If you have laravel installed correctly with correct folder structure, you should be able to use a relative url and asset helper.

<img src="<?php echo asset('assets/upload/imgdogs') . '/' . $row->dogpic; ?>" alt="">

https://laravel.com/docs/5.6/helpers#method-asset

I'm not clear on what you're meaning. Are the urls saved in the database or something? If that's the case, you could do a query like

REPLACE(columnName, 'https://aa.com/', 'https://bb.com/');

That would change all instances of https://aa.com/whatever into https://bb.com/whatever in the "columnName" column.

https://dev.mysql.com/doc/refman/5.7/en/replace.html

And along those lines, it is better just to store the file name, and build url to view it.

rover.jpg

Not

https://somesite/myimages/rover.jpg

use helper to build myimages/rover.jpg or whatever url it is.

@jlrdw I totally agree with that. Don't store domain specific urls in the database. You never know when you will change domains, or directories that the images are stored, etc. Just store the filename and output it in html how you need it. <img src="//img/{{ $row->imagename }}">

Better yet, make a config file with the paths to different image types.

config/imagelocations.php

<?php

return [
    'profiles' => '//img/profiles/',
    'avatars' => '//img/avatars/'
];

<img src="{{ config('imagelocations.profiles')}}{{ $row->imagename }}">

Then if you ever change directories, you just have to update the single place in the config file and it will change them everywhere automatically.