Help me repair this inflatable armchair with a hole in an awkward spot

My pup had the zoomies and jumped onto this inflatable armchair and bit down on the arm. He was very unhappy when it started to make a hissing noise and deflate underneath him! I was able to easily patch the top hole with Tear-Aid Type A. The bottom hole is just underneath a seam and is giving me trouble. It looked at first like it was sealed, but it's slowly leaking. At first I thought the air was escaping along the top edge of the seam, so I cut the patch to test it - you can see the rough edge where it was cut. No change. So now I think that the air is just barely pushing along the crease of the seam and out to either side. There is no visible "bubbling" or hissing noise, and I can't feel any air movement. It's a very small leak.

What's the best way to fix this? I can't remove the patch to start over. Should I try to put more patching material on either side of where I'm guessing it's leaking? If so, any tips on getting it ALL the way into the crease so I don't get the same issue again? It's very sticky stuff and if I accidentally touch it to the wrong spot, it won't come off and then reattach cleanly.

Howdy,

As a white water rafter, the emergency quick fix was always...duck tape.

What kind of material is the inflate chair? Did they give you a patch kit? Seam leaks or close to seam leaks can be the hardest to patch. Roughing up material with sandpaper will help glue stick. Some craft and fabric stores sell patch kits for different kinds of fabrics.  If your going to try and patch over the seam(big patch), getting it as flat as possible and weight on the patch, maybe even clamp it, and keep it pressed tight for 24 hrs, might help.

Nice looking "bad" dog...