This injury, from January 2023, to my lab cost me $2500.00 for an emergency vet. I was playing chuckit with my dog in the backyard when she chased the ball and slid after it over the metal lawn edging. She just sat up and didn't move. I ran up to her to find she sliced her rear leg open pretty badly on the corner of the metal edging. I could see it was a deep cut but couldn't tell how deep or what damage she did. I was greatly concerned she had cut a tendon because she wouldn't walk. It was a little after 4:00 pm and our vet said they were closing so we had to take her to an emergency vet where she had immediate surgery. Thankfully, she missed the tendon but it was really deep in the muscle. I am glad I didn't wait until the next morning as she was in pain. I slept on the floor next to her that night and she moaned in pain all night. She has recovered very well thankfully with no repercussions form it but it took months for her to trust her leg.
Each incident is so subjective as to what should or shouldn't be treated promptly it's hard to use a forum to make that decision. I couldn't let cost, at least, to a point, dictate my dogs treatment. If you have a dog, it's to your best interest to keep a "dog injury" savings account as it will get used.