I have a yellow lab (4 years old). Like all labs she has an insatiable appetite and I keep a very close eye on her weight and she is quite trim.
She goes to a daycare provision and on several occasions when she returns she is absolutely massive - like she's scoffed a ton of kibble. When I've asked the guys who run the daycare I've been told that she hasn't had any extra food or got into their food storage. She never gets like that when not at daycare unless she somehow gets into the kibble sacks.
She seems well and healthy (except last night when she was clearly too full to feel comfortable) with lots of energy. She isn't massively farty so I don't think it is bloating. It just looks like her stomach is completely full.
Assuming the daycare guys are telling the truth, what could be making her so fat? Are there any medical conditions that could cause this?