Downandunder - That depends on a few things really. Firstly, it depends on your definition of good, I will never be a millionaire, but I am pretty comfortable. It also depends on where you work, I used to work for someone else in a grooming salon, and the money was abysmal, minimum wage and the owner kept all the tips, and we worked unpaid overtime with no breaks. However, I opened my own business last year, and there is no comparison! I now keep everything I earn (well after setting some aside for overheads and tax etc!), and how hard I work directly reflects how much I take home, which I love. In terms of figures, as an example, I worked school hours last month (9-3), five days a week, and took home £1800 + tips. So I'll never be rich, but I'm happy with that amount. I also keep my overheads down as my business is based at home in a cabin based salon in my garden (sounds horrible but it's lovely, honestly!) which means I have no rent to pay on an expensive shop, so more profit for me to keep. 
You should go for it! It can be hard work, and sometimes back breaking, but I've never been happier, and it genuinely never gets old seeing dogs and puppies all day! I get so many kisses and cuddles, and I love making them all look and smell nice 