dog stumbling/staggering after running for a bit.

[mybeagles]

Heart murmur will do this.....pour water on them and they go run again. There are some FC stud dogs passing this trait as its hereditary. Vet can determine this very quickly by listening. I've seen a couple like this and heard of a couple others.

They normally don't recover so quick with low sugar.

Some dogs just don't handle heat very well.

[jt's kennel]

i had a year old dog do this today. except he was throwing up. would this be from getting to hot. or something else? he was running hard for 2 hours.