Affordable Emergency Vet

Hi, everyone. My dog has started randomly coughing, dry heaving and sometimes vomiting white or lightly-tinted pink foam and what looks like to be “water.” I usually take him to the North Loop Low Cost Pet Clinic but unfortunately, they close early on Saturdays. I wanted to ask if anyone knew of an affordable ER Vet or at least one that lets you pay the big bills in payments (very hard to find, I know :/ ) or if anyone knows of any affordable vet clinics open on Sundays. Luckily, he’s still wagging his tail and being the goodest of all good boys but I’m scared if I wait til his usual vet opens on Monday, he’ll get significantly worse. I just want to make sure he’s okay. TIA!😊