Before you hand the cashier your money, be sure and ask them for a breakdown of how much each item cost. The receipt just gives you a total which is useless if you think you've been overcharged.
Last time I went (a month ago), I was almost overcharged for 1 of the 2 bags of 30lb dog food I bought but the total seemed off so I asked and they took off the $6 sale price. I was overcharged by $1 for an Ezydog harness which I didn't notice until I got home and looked at the tag. However, since I don't live in the area, it wasn't worth it to me in terms of gas to quibble over a dollar.
When I went today to restock my larger dog's feed supply, I was almost overcharged again (same dog food and same sale price- $6). It's noticeable if you buy just the one item but not so much when you buy multiple items- and I always buy 2 bags of dog food to save myself a trip.
On a good note, if you want to adopt a puppy or at least cuddle/socialize them, there's an organization that's at this location on Friday afternoons. Please think carefully about adopting! They're cute at 8 weeks but they grow up and require a lot of effort and commitment.
I am not affiliated with any of the following websites. I just think they're useful for clueless dog owners, new or otherwise.
http://www.dogstardaily.com/free-downloads - Before AND After You Get Your Puppy by Ian Dunbar in pdf format
http://dogsintraining.livejournal.com/ - online forum focusing on progressive reinforcement dog training
http://www.youtube.com/user/kikopup?blend=1&ob=5 - videos on progressive reinforcement dog training
http://www.lifescript.com/life/family/pets/dog_park_danger.aspx - some dangers that can be found at dogparks