I would not return to this facility unless it was a life threatening emergency and I didn't think my cat would survive to make it to another facility. Even then I would doubt their ability to properly care for my cat. I can't speak to their ability to diagnose a dog, but I took my cat there for a routine problem after hours. I even told the vet what I thought it was.
His response? Not an abcess, just a bump. Didn't prick test, didn't check the puncture site, barely even looked at my cat properly. Gave my cat some antibiotics and sent us on our way. I should have questioned his diagnosis. My cat ended up having to have a procedure at his normal vet not even 72 hours later for the exact thing I told the ER vet I thought it was. I do recognize it could have been smaller when I went to the ER. I do realize it grew in size over the 72 hours. But if I with no medical training knew what it was and could feel it and felt it needed draining, why didnt a licensed vet know it did too?
Instead I listened to the vet and waited in vain for the medicine to work. Luckily I measured and realized it was getting bigger and my regular vet was able to squeeze me in. Plus it cost less to have it properly cared for then have someone basically brush me off.