My husband and I are both overweight but TBH it makes us more paranoid about our dogs NOT being overweight! Josie is a springer x lab (looks like a lab with springer legs and ears) and loads of people compliment us on her size as she is quite sleek. However she is very lucky as if she does gain a bit and look a bit wider round the waist, we just cut down on her food for a couple of days and it shifts really quickly and easily (wish I could do the same!)
Josie weighs 26k, Suki weighs 23K and Buffy only weighs 9K - have no idea what Poppy weighs, but she is really titchy so not worried about it yet anyway.
Vets should not be afraid to tell owners they are killing their pets with kindness - hopefully people would at least listen if their vet told them?