Their purpose is to tie the dog to a female during breeding to increase chances of a successful mating and prevent males from coming in and mating immediately after a different male (and thus creating competition) - its job is to swell whenever the animal is in a state of arousal (excitement in general to any stimuli) and is quite common... comes and goes, nothing to worry about.
SG S-Hunter vom Geistwasser CA CGN TT ATD (Airport Wildlife Control K9)
Zenna vom Geistwasser NTD
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