Wow, what can I say, this episode was gold~ The flashback scene for the episode opener was interesting, there were no boring human sub-plots, the guest pet was really cool, the concept taken from the movie 'Groundhog Day' really worked well here, we see all the pets doing everything, this was a Russell episode (okay, not exactly a positive, but he's my favorite character), and we get to see Russell's version of 'Dance Like You Know You Can' so it's a nice throwback to another great episode. This episode was chock full of positives! I'd rather not bother with every detail on how great this episde was, it's better you just see it for yourself~
We also find out that Russell was the second-to-last pet to join the day camp. I had no idea until now that most of the pets have been around the pet shop for years. Considering Mrs. Twombly's hair color in the flashback, the pets must be older than I thought... Now this is not a negative nor a nitpick, but rather something confusing: it's known that hedgehogs have short life expectancies (5-7ish years) so even if you assume the flashback scene took place 5 years in the past, it seems a little odd that Mrs. Twombly's hair would have such a short time to turn gray.
But whatever, I think it's unnecessary to look too deep into something unimportant in an otherwise great episode. Like I said, this episode had everything I could possibly want in an episode and I couldn't ask for better~ This is an episode I can actually watch again and again. I give it a 10/10.